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	<title>立命館大学数理科学科 &#187; 談話会</title>
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	<description>立命館大学理工学部数理科学科です。幅広い領域での数学の研究・活用を通して人類の福祉と発展に貢献できる人材を育成することを目標としています。</description>
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		<title>数理科学科談話会（2026/06/23）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=2316</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=2316#comments</comments>
		<pubDate>Thu, 18 Jun 2026 04:08:54 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[談話会]]></category>

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		<description><![CDATA[日時：6月23日（火）17:00-18:00
会場：立命館大学BKC　ウェストウィング6階　談話会室
コメンテーター：Gael Meigniez (Université d'Aix-Marseille)]]></description>
				<content:encoded><![CDATA[<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">日時：6月23日（火）17:00-18:00</span><br />
	<span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">会場：立命館大学BKC　ウェストウィング6階　談話会室</span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">コメンテーター：Gael Meigniez (<span lang="EN-US" style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Université d&#8217;Aix-Marseille</span>)</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル：The h-principle and foliations</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">概要：</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">This talk will introduce to the first ideas of Gromov&#8217;s h-principle and to some of its developments for the construction of foliations on open and closed manifolds.</span></span></div>
<div>&nbsp;</div>
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		<title>数理科学科談話会（2026/06/08）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=2309</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=2309#comments</comments>
		<pubDate>Mon, 08 Jun 2026 03:12:04 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=2309</guid>
		<description><![CDATA[日　  時：2026年6月8日（月）
場　  所：立命館大学BKC ウェストウィング6階　談話会室
講演者1：Frederic Herau (Univ. Nantes)
講演者2：木上淳（京都大学）]]></description>
				<content:encoded><![CDATA[<div data-olk-copy-source="MessageBody" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">日時：2026年6月8日（月）</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">場所：立命館大学BKCキャンパスウェストウィング6階　談話会室</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&nbsp;</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">プログラム：</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">17:00~17:50 Frederic Herau (Univ. Nantes)</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&gt;From hypocoercivity with small parameters to immiscibility considerations<br />
	<br />
	18:00~18:50 木上淳（京都大学）</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">Toward &nbsp;”Analysis on Metric spaces”; Constructions of Sobolev spaces and Brwonian motions</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">（距離空間上の解析学に向けて：ソボレフ空間とブラウン運動の構成）</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&nbsp;</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">19:00~ レセプションパーティー</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&nbsp;</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&nbsp;</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">アブストラクト：</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;"><b>From hypocoercivity with small parameters to immiscibility considerations&nbsp;</b></div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">Abstract : The theory of hypocoercivity is rather new, going back<br />
	to the early 20&#8242; and dealing with the large time behavior of kinetic equations and out of equilibrium systems.<br />
	In this talk, I will recall some historical points about hypocoercivity and present some recent preliminary asymptotic<br />
	results related to immiscibility of fluids.</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&nbsp;</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;">&nbsp;</div>
<div style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alternates: inherit; font-variant-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; font-size: 12pt; line-height: inherit; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif, serif, EmojiFont; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-variation-settings: inherit; font-language-override: inherit; margin: 0px; padding: 0px; vertical-align: baseline; direction: ltr;"><b>Toward &nbsp;”Analysis on Metric spaces”; Constructions of Sobolev spaces and Brwonian motions</b><br />
	Abstract: A wide variety of &#8220;Analysis&#8221; has been developed &nbsp;and applied to every area of science since the introduction of differentiation by Newton and Leibniz. However, the emergence of “fractals” as models of natural objects and phenomena has raised the question of how we can tackle analysis on spaces that are nowhere smooth. For example, typical self-similar sets, such as the Sierpinski gasket and carpet, do not possess a differential structure; hence, it is difficult to apply analyses based on differentiation. Based on this question, studies on analysis on fractals began in the late 1980s with the pioneering works of Goldstein, Kusuoka, and Barlow-Perkins who constructed the Brownian motion on the Sierpinski gasket. In this talk, I will review some of the progress made toward analyzing (non-smooth) metric spaces, specifically the construction of Sobolev spaces and Brownian motions.<br />
	——————————<br />
	タイトル：距離空間上の解析学に向けて：ソボレフ空間とブラウン運動の構成<br />
	アブストラクト：ニュートンとライプニッツによって微分の概念が導入されて以来、様々な解析学が発展し、応用されてきた。一方、１９７０年代にマンデルブローは自然界の物の形のモデルとしてフラクタルという概念を導入した。自己相似集合に代表されるフラクタルは、至る所滑らかでない構造をもっており、従来の微分を基礎とした解析学を適用することは難しい。それでは、フラクタルのような複雑な空間の上での現象を記述する解析学はどのように構築すればよいのであろうか？この疑問に答えるべく、１９８０年代後半から「フラクタル上の解析学」の研究が、Goldstein, Kusuoka, Barlow-Bass による Sierpinski gasket 上へブラウン運動の構成を嚆矢として発展してきた。この講演では、フラクタルのような（滑らかでない）距離空間上での解析学の研究の発展を、とくにソボレフ空間とブラウン運動の構成という視点から概観する。</div>
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</div>
<br />
]]></content:encoded>
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		<title>数理科学科談話会 （2023/11/15）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1989</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1989#comments</comments>
		<pubDate>Thu, 09 Nov 2023 04:17:52 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[トピックス]]></category>
		<category><![CDATA[ニュース＆イベント]]></category>
		<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1989</guid>
		<description><![CDATA[日　時：2023年11月15日（水）16:30～17:30
場　所：立命館大学BKC ウエストウイング6階
　　　　 談話会室 /オンライン（Zoom）
講演者：John Parker 氏 (Durham Univ.)]]></description>
				<content:encoded><![CDATA[<div>1<span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">1月15日 ( 水 ) に立命館大学数理科学科談話会が行われます．</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">みなさまのご参加をお待ちいたしております．</span></span><br />
	&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">日　時：2023年11月15日（水）16:30～17:30</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">開催方法：&nbsp;</span></span></div>
<div style="margin-left: 40px;"><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">・立命館大学BKCキャンパス ウエストウイング6階談話会室での対面形式</span></span></div>
<div style="margin-left: 40px;"><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">・Zoomミーティングによるオンライン配信</span></span></div>
<div style="margin-left: 40px;"><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">オンラインでの参加をご希望の方は，下記のURLよりご登録のほどお願い申し上げます．</span></span></div>
<div style="margin-left: 40px;"><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">https://ritsumei-ac-jp.zoom.us/meeting/register/tJ0tceutrD4pHtWjZtVgSAJdzQKXEA9WSGSv</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">講演者：John Parker 氏 (Durham Univ.)</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル：Geometry, tessellations and surfaces</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト：</span></span></div>
<div style="margin-left: 40px;"><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">In this talk I will explain the relationship between two dimensional tessellations (sometimes called tilings) and surfaces. In order to do so, I will need to introduce the geometry of spaces of constant curvature, where this curvature could be zero, positive or negative. The talk will be at a elementary level with many pictures.</span></span></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">連絡先： 高橋典寿 ( 立命館大学理工学部数理科学科，e-mail: ntakaha[at]fc.ritsumei.ac.jp )</span></div>
]]></content:encoded>
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		<title>数理科学科談話会（2023/10/25）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1984</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1984#comments</comments>
		<pubDate>Wed, 18 Oct 2023 02:35:01 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[トピックス]]></category>
		<category><![CDATA[ニュース＆イベント]]></category>
		<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1984</guid>
		<description><![CDATA[日　時：2023年10月25日(水) 16:30-18:15
場　所：立命館大学BKC  ウエストウイング6階  
　　　　 談話会室 /オンライン（Zoom）
講演者：亀岡健太郎 氏 (立命館大学)
　　　　Shanola Smitha Sequeira 氏 (立命館大学)
]]></description>
				<content:encoded><![CDATA[<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">10月25日 (水) に立命館大学談話会を以下の要領で開催いたします．</span></span></div>
<div>&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">日時：10月25日(水) 16:30-18:15</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">講演者 / タイトル：</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">　亀岡健太郎 氏 (立命館大学) / 共鳴の数理解析</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">　Shanola Smitha Sequeira 氏 (立命館大学) / Representation of compact operators between Banach spaces</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">開催方法：</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">　立命館大学BKCキャンパス ウエストウイング6階談話会室での対面形式</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">　Zoomミーティングによるオンライン配信</span></span></div>
<div>&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">オンラインでの参加をご希望の方は，下記のURLよりご登録のほどお願い申し上げます．</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">https://ritsumei-ac-jp.zoom.us/meeting/register/tJYpcOCopjgrGdNecv7Ak4p9RnOhdLTJfp1D</span></span><br />
	<br />
	<a href="http://www.math.ritsumei.ac.jp/home2/wp-content/uploads/a78c71252c62dd89c37919ef7f3b8b51.pdf">ポスター</a><br />
	&nbsp;</div>
<br />
]]></content:encoded>
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		<title>数理科学科談話会 （2023/5/31）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1966</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1966#comments</comments>
		<pubDate>Mon, 29 May 2023 04:22:18 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[トピックス]]></category>
		<category><![CDATA[ニュース＆イベント]]></category>
		<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1966</guid>
		<description><![CDATA[日時：2023年5月31日（水）16:30-17:20
場所：立命館大学BKCキャンパス・ウエストウイング6階談話会室/オンライン（zoom）
講演者: Jens Wittsten氏（Boras University / 立命館大学）]]></description>
				<content:encoded><![CDATA[<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">5月31日（水）に，立命館大学談話会を以下の要領で対面とzoomのハイブリッド形式で開催いたします．</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">講演者はBoras University / 立命館大学のJens Wittsten氏です．</span></span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">オンラインから参加をご希望の方は以下のリンクから登録を行なってください．</span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;"><a href="https://ritsumei-ac-jp.zoom.us/meeting/register/tJArdemgpzwqH9KBW7xv7_OR46GNfchaxUhK#/registration" target="_blank">https://ritsumei-ac-jp.zoom.us/meeting/register/tJArdemgpzwqH9KBW7xv7_OR46GNfchaxUhK</a></span></span><br />
	<br />
	<div>&nbsp;</div>
	<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">日時：2023年5月31日（水）16:30-17:20</span></div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">場所：立命館大学BKCキャンパス・ウエストウイング6階談話会室/オンライン（zoom）</span></span></div>
	<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">講演者: Jens Wittsten氏（Boras University / 立命館大学）</span><br />
		<span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル: Mathematics of magic angles for twisted bilayer graphene</span></span></div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト: </span></span></div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">Magic angles are a hot topic in condensed matter physics: when two sheets of graphene are twisted by those angles the resulting material is superconducting. I will present a very simple operator whose spectral properties are thought to determine which angles are magical. It comes from a recent Physical Review Letter by Tarnopolsky–Kruchkov–Vishwanath. The mathematics behind this is a blend of representation theory (of the Heisenberg group in characteristic three), Jacobi theta functions and spectral instability of non-self-adjoint operators (involving Hörmander’s bracket condition in a simple setting). The results will be illustrated by colourful numerics which suggest some open problems. This is joint work with S. Becker, M. Embree, and M. Zworski.</span></span></div>
</div>
<br />
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		<title>数理科学科談話会 （2022/12/21）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1904</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1904#comments</comments>
		<pubDate>Mon, 12 Dec 2022 05:35:44 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1904</guid>
		<description><![CDATA[日程：12月21日（水） 16:30-17:30
形式：学外の方は原則オンライン
講演者：John Hunton 氏 (Durham Univ.)
]]></description>
				<content:encoded><![CDATA[<div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">形式：学外の方は原則オンライン(Zoom)での参加．</span></span></div>
	<div style="margin-left: 40px;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">学内の方は談話会室での対面による参加も可能ですが，</span><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">対面参加数が多い場合は適宜人数制限を行います．</span><br />
		&nbsp;</div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">時間：16:30 ～ 17:30</span></span></div>
	<div>&nbsp;</div>
	<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">登録URL：</span><a href="https://ritsumei-ac-jp.zoom.us/meeting/register/tJwldeuvqTwuHtJt41uYercDJtfyH_i_Bm1D" style="font-family: arial, helvetica, sans-serif; font-size: 14px;" target="_blank">https://ritsumei-ac-jp.zoom.us/meeting/register/tJwldeuvqTwuHtJt41uYercDJtfyH_i_Bm1D</a></div>
	<div>&nbsp;</div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">講演者：John Hunton 氏 (Durham Univ.)</span></span></div>
	<div>&nbsp;</div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル：Aperiodic Order – a tour through Logic, Topology, Dynamics and Continued Fractions</span></span></div>
	<div>&nbsp;</div>
	<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト：</span></span></div>
	<div style="margin-left: 40px;"><span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">Aperiodic Order is the term used to discuss often geometric phenomena which are not perfectly symmetric, yet have strong global structure and often approximate symmetries. The most well known examples are the aperiodic tilings of Penrose and others: tilings of the plane that never repeat, yet are highly structured and very far from being random.</span></div>
	<div style="margin-left: 40px;">&nbsp;</div>
	<div style="margin-left: 40px;"><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">This talk will be a gentle introduction to some of the topics arising in the field of Aperiodic Order. After sketching its historical inception, we shall concentrate of the use of topology as a tool to think about it, linking to aspects of dynamics, ergodic theory and even continued fractions.</span></span></div>
	<div>&nbsp;</div>
	<div><br />
		<br />
		<span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">連絡先：高橋典寿（e-mail：ntakaha [at] fc.ritsumei.ac.jp）</span></span></div>
	<div>&nbsp;</div>
</div>
<br />
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		<title>数理科学科談話会 （2022/12/7）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1883</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1883#comments</comments>
		<pubDate>Thu, 24 Nov 2022 05:22:25 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1883</guid>
		<description><![CDATA[日程：12月7日（水） 16:30-17:30
場所：立命館大学BKCキャンパスウエストウイング談話会室（対面とzoomのハイブリッド開催）
講演者：本永翔也（立命館大学）]]></description>
				<content:encoded><![CDATA[<div>
	<div><span style="font-family:arial,helvetica,sans-serif;"><span style="font-size:14px;">12月7日（水）に談話会を開催します．</span></span></div>
	<div><span style="font-family:arial,helvetica,sans-serif;"><span style="font-size:14px;">学外からご参加いただける場合は原則，zoom（オンライン）上での参加をお願いいたします．ご参加の場合は平良（ktaira@fc.ritsumei.ac.jp ）までご連絡ください．</span></span></div>
	<br />
	<span style="font-family: arial, helvetica, sans-serif; font-size: 14px;">日程：12月7日（水） 16:30-17:30</span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">場所：立命館大学BKCキャンパスウエストウイング談話会室（対面とzoomのハイブリッド開催）</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">講演者：本永翔也（立命館大学）</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル：Aubry-Mather理論における作用最小化集合とMather関数の関係</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト：</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">古典力学におけるEuler-Lagrange方程式および対応するHamilton力学系の解軌道は，作用汎関数を極小化するものとして特徴づけられることが知られている（変分原理）．では，作用汎関数を（極小化ではなく）最小化する解軌道は，どのような挙動を示すだろうか？Aubry-Mather理論では，作用を最小化するという観点から，Mather集合・Aubry集合・Mañé集合という不変集合が導入される．本講演では，これらの定義や性質を紹介するとともに，パラメータ付き作用汎関数の最小値として定義されるMatherのβ関数・α関数との関係について講演者が得た結果を述べる．また，Matherのβ関数の微分可能性が，対応する力学系のある種の可積分性(Lagrangeグラフによる葉層構造の存在)を特徴付けるかという問題に対して，主結果から分かることについても説明する．</span></span><br />
	<div>&nbsp;</div>
</div>
<br />
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		<title>立命館大学数理科学科談話会（2022年9月1日（木））</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1860</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1860#comments</comments>
		<pubDate>Sat, 27 Aug 2022 06:44:39 +0000</pubDate>
		<dc:creator><![CDATA[mathstaff]]></dc:creator>
				<category><![CDATA[トピックス]]></category>
		<category><![CDATA[ニュース＆イベント]]></category>
		<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1860</guid>
		<description><![CDATA[<<立命館大学数理科学科談話会>>
日時：2022年9月1日（木） 16:30～17:30
講演者：Wolfram Bauer （Leibniz Universität Hannover）]]></description>
				<content:encoded><![CDATA[<div>&lt;&lt;立命館大学数理科学科談話会&gt;&gt;</div>
<div>日時：2022年9月1日（木） 16:30～17:30</div>
<div>講演者：</div>
<div>Wolfram Bauer （Leibniz Universität Hannover）</div>
<div>題目：Subriemannian geometry and analysis of associated operators</div>
概要：<br />
<a href="http://www.math.ritsumei.ac.jp/home2/wp-content/uploads/77878e89a7551c430c9e8f67e943e0ac.pdf">PDFファイル</a>をご覧ください．<br />
<br />
開催方法：<br />
<div>ウェストウィング6階談話会室での講演の模様をZoomミーティングで配信する予定です．</div>
<div>上記ファイル内に記載されたURLの申込フォームより8月31日（水）までにお申し込みください．</div>
<div>登録された方にセミナー当日の昼頃までにZoomミーティングの情報をお送りいたします．</div>
<br />
問い合わせ先：立命館大学理工学部数理科学科 高橋 典寿]]></content:encoded>
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		<title>数理科学科談話会 （2022/7/29）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1851</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1851#comments</comments>
		<pubDate>Tue, 26 Jul 2022 05:24:37 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1851</guid>
		<description><![CDATA[日時：7月29日(金)  17:00-18:00
場所：立命館大学びわこ・くさつキャンパス
　　　 ウエストウイング６階 談話会室
　　　 （対面とzoomのハイブリッド開催）
講師：今野紀雄（横浜国立大学）]]></description>
				<content:encoded><![CDATA[<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">7月29日（金）に談話会を開催します．</span></span></div>
<div>&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">学外からご参加いただける場合は原則，zoom（オンライン）上での参加をお願いいたします．ご参加の場合は中川（nkgw-t@fc.ritsumei.ac.jp ）までご連絡ください．</span></span></div>
<div>&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">日程：7月29日（金）17:00-18:00</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">場所：立命館大学BKCキャンパスウエストウイング談話会室（対面とzoomのハイブリッド開催）</span></span></div>
<div>&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">講演者：今野紀雄（横浜国立大学）</span></span></div>
<div>&nbsp;</div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル： 量子ウォークからゼータ対応へ</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト：</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">ここ一年程にわたる我々の一連のゼータ対応シリーズは，無限グラフに関する先行結果を，離散時間のグローバー型量子ウォークに対する今野・佐藤の定理 (2012) をトーラスに適用することにより同じ表式が導出可能であることに気づくことから誕生した．それ以降，「新しいタイプのゼータ関数」を適宜導入することにより，グローバー型だけでなく，全ての量子ウォークでも適用可能であり，また，ランダムウォーク，相関付ランダムウォーク，開量子ランダムウォーク，さらに，量子ウォークの正台のような通常の意味でウォークといえないモデルまで扱えることが明らかになった．一方，上述の一粒子系だけでなく，多粒子系（確率セルオートマトンや量子セルオートマトンなど），また対応する連続時間モデルまで拡張可能であることも分かった．ごく最近では，数論，トロピカル幾何，可積分系とも密接な関連があるマーラー測度との関係も見いだされた．本講演では，量子ウォークを概説した後に，ゼータ対応シリーズの中から，量子ウォークに関連する内容を主に紹介したい．</span></span></div>
]]></content:encoded>
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		<title>数理科学科談話会 （2022/7/21）</title>
		<link>http://www.math.ritsumei.ac.jp/home2/?p=1848</link>
		<comments>http://www.math.ritsumei.ac.jp/home2/?p=1848#comments</comments>
		<pubDate>Wed, 20 Jul 2022 06:57:26 +0000</pubDate>
		<dc:creator><![CDATA[horie]]></dc:creator>
				<category><![CDATA[談話会]]></category>

		<guid isPermaLink="false">http://www.math.ritsumei.ac.jp/home2/?p=1848</guid>
		<description><![CDATA[日時：7月21日（木）16:30-19:00
場所：立命館大学びわこ・くさつキャンパス
　　　 ウエストウイング６階　談話会室
　　　 （対面とzoomのハイブリッド開催）
講師：鈴木良一（立命館大学）
　　　 磯崎洋（立命館大学）]]></description>
				<content:encoded><![CDATA[<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">7月21日（木）に談話会を開催します．</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">学外からご参加いただける場合は原則，zoom（オンライン）上での参加をお願いいたします．ご参加の場合は平良（ktaira@fc.ritsumei.ac.jp ）までご連絡ください．</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">日程：7月21日（木）16:30-19:00</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">場所：立命館大学BKCキャンパスウエストウイング談話会室（対面とzoomのハイブリッド開催）</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">16:30-17:30：鈴木良一（立命館大学）</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル: Malliavin-Sokorohod calculus for canonical Lévy processes with applications</span></span></div>
<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト: In this talk, we deal Malliavin-Sokorohod (MS, in short) calculus for canonical Lévy processes with applications, especially mathematical finance. MS calculus is a set of mathematical techniques and ideas that extend the mathematical field of calculus of variations from deterministic functions to stochastic processes. In particular, it allows the computation of ‘’derivatives” of random variables, such as functionals for Lévy processes, stochastic integrals and stochastic differential equations.&nbsp; MS calculus is also called the stochastic calculus of variations.&nbsp;</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">&nbsp;The first half of the presentation, we introduce MS calculus for canonical Lévy processes. Especially, we use chaos expansion, derivative operator and increment quotient difference operator for Lévy functionals. Calculations tools about MS calculus are also introduced. By using the results, we next derive a new modified $\Phi$-Sobolev type inequalities for canonical Lévy processes and we also derive concentration inequalities. Moreover, asymptotic estimates for their inequality will be given.&nbsp;</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">&nbsp;The second half of the presentation will address issues to mathematical finance. In particular, we consider locally risk minimizing hedging strategies, a typical hedging technique in incomplete markets. The presentation will introduce a method using Malliavin analysis, which provides a concrete expression formula and can be applied to numerical analysis and other practical problems. The use of Malliavin analysis provides concrete expression formulas, which can be applied to numerical analysis and other practical applications.</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">&nbsp;In the remaining time, we will discuss future prospects.</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">18:00-19:00：磯崎洋（立命館大学）</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">タイトル：グラフ上のラプラシアンに対する Gel&#8217;fand の問題</span></span></div>
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<div><span style="font-size:14px;"><span style="font-family:arial,helvetica,sans-serif;">アブストラクト：</span></span><a data-auth="NotApplicable" data-linkindex="0" href="https://drive.google.com/file/d/1p1G0EdCm6fRUTsd3qRYOxo8lNhOBmj0x/view?usp=sharing" id="LPlnk231958" rel="noopener noreferrer" style="border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: &quot;ＭＳ Ｐゴシック&quot;, sans-serif; margin: 0px; padding: 0px; vertical-align: baseline; outline: 0px; color: rgb(5, 99, 193);" target="_blank" title="https://drive.google.com/file/d/1p1G0EdCm6fRUTsd3qRYOxo8lNhOBmj0x/view?usp=sharing"><span style="border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 11pt; line-height: inherit; font-family: inherit; margin: 0px; padding: 0px; vertical-align: baseline; color: inherit;">https://drive.google.com/file/d/1p1G0EdCm6fRUTsd3qRYOxo8lNhOBmj0x/view?usp=sharing</span></a></div>
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