{"id":408,"date":"2026-01-22T10:14:34","date_gmt":"2026-01-22T09:14:34","guid":{"rendered":"https:\/\/web.umons.ac.be\/fs-mathematique\/?page_id=408"},"modified":"2026-03-10T17:16:01","modified_gmt":"2026-03-10T16:16:01","slug":"chaire-francqui25-26","status":"publish","type":"page","link":"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/","title":{"rendered":"Chaire Francqui 2025-2026"},"content":{"rendered":"<h1 align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/210\/2026\/01\/header.jpg\" width=\"546\" height=\"137\" \/><\/h1>\n<h1 class=\"western\" align=\"center\">FRANCQUI Chair |<span style=\"color: #069a2e;\">2025&#8211;<\/span><span style=\"color: #069a2e;\">2026<\/span> |<\/h1>\n<p align=\"center\"><span style=\"color: #069a2e;\"><span style=\"font-size: xx-large;\">Professor Fran\u00e7ois Loeser<\/span><\/span><\/p>\n<h1 style=\"text-align: center;\"><span style=\"font-size: 14pt;\"><a href=\"https:\/\/www.imj-prg.fr\/\">Institut de Math\u00e9matiques de Jussieu-Paris Rive Gauche<\/a><\/span><\/h1>\n<p align=\"left\">A Francqui Chair has been awarded by the <a href=\"http:\/\/www.francquifoundation.be\/\">FRANCQUI Foundation<\/a> to Professor <a href=\"https:\/\/webusers.imj-prg.fr\/~francois.loeser\/en.php\">Fran\u00e7ois Loeser; <\/a><br \/>\nHe will visit Belgium during -the month of March and at the beginning of April. He will deliver a series of lectures that may be attended independently of one another. Each reading will kick off with an introductory part about the topic of the day. The theme will revolve around non-Archimedean methods and valued fields.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/210\/2026\/01\/Loeser.png\" width=\"140\" height=\"187\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: large;\"><b>The Inaugural Lecture<\/b> will take place on <b>Thursday, 12th March 2026<\/b>, at UMONS, Building BSM, Auditorium. Hermann, Campus of the Plaine de Nimy, Maistriau Avenue, Mons<\/span><\/p>\n<p><span style=\"font-size: medium;\">15:45 Welcome Introduction<\/span><\/p>\n<p><span style=\"font-size: medium;\"><b>16:00<\/b> <b>F. Loeser<\/b> : <i>On the unexpected ubiquity of non-archimedean methods in mathematics<\/i><\/span><\/p>\n<p><span style=\"font-size: medium;\">17:15 Reception<\/span><\/p>\n<p><span style=\"font-size: medium;\">Registration for the inaugural lecture is required. <\/span><strong><span style=\"font-size: medium;\"><u>Due to space restrictions, the number of attendants will be limited to 60 people . <\/u><\/span><\/strong><strong><span style=\"font-size: medium;\"><u>Please use the following link <a href=\"https:\/\/forms.gle\/SgjLhCTmKq3Mqoyp6\">Registration<\/a><\/u><\/span><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"font-size: large;\"><u>All the l<\/u><\/span><\/strong><strong><span style=\"font-size: large;\"><u>ectures will take place <\/u><\/span><\/strong><strong><span style=\"font-size: large;\"><u>at UMONS, Building BSM, Auditorium. Hermann, Campus of the Plaine de Nimy, Maistriau Avenue, Mons<\/u><\/span><\/strong><strong><span style=\"font-size: large;\"><u><br \/>\n<\/u><\/span><\/strong><\/p>\n<p><strong><span style=\"font-size: medium;\"><b>Schedule<\/b><\/span><\/strong><\/p>\n<ul>\n<li><span style=\"font-size: medium;\"><strong>Thursday 19\/03\/2026 16:00-18:15 :<\/strong><i>Ax-Kochen-Ershov Theorems, old and new<\/i><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt;\">Abstract: The classical Ax-Kochen-Ershov Theorem asserts that p-adic fields and fields of power series over finite fields have the same limit theory. We shall explain how it follows from a cell decomposition theorem due to Denef and Pas. This theorem allows to transfer statements from local non-archimedean fields of characteristic zero to characteristic p and vice-versa. We shall explain how such transfer results can be extended to definable sets (work with J. Denef) and to integrals (work with R. Cluckers). We shall end with some explicit examples.<\/span><\/p>\n<ul>\n<li><span style=\"font-size: medium;\"><strong>Friday 20\/03\/2026 16:00-18:15 :<\/strong> <i>Non-archimedean integrals as limits of complex integrals<\/i><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt;\">Abstract: The asymptotic behavior of complex analytic objects is often described in terms of non-archimedean geometry. In this talk we shall explain how non-Archimedean integrals considered by Chambert-Loir and Ducros <\/span><span style=\"font-size: 12pt;\">naturally arise in asymptotics of families of complex integrals. To perform this analysis, we work over a nonstandard model of the field of complex numbers, which is endowed at the same time with an Archimedean and a non-Archimedean norm. Such fields were introduced long ago by Abraham Robinson with the explicit hope that they would be useful for asymptotic analysis. This is joint work with A. Ducros and E. Hrushovski.<\/span><\/p>\n<ul>\n<li><span style=\"font-size: medium;\"><strong>Tuesday 31\/03\/2026 16:00-18:15 :<\/strong> <i>Arcs and Monodromy<\/i><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt;\">Abstract: Somewhat unexpectedly, formal arcs play an important role in the study of singularities of complex hypersurfaces, in particular in relation with the Milnor fiber and its monodromy. After reviewing these results we shall explain how that connexion can be understood in terms of non-archimedean geometry and how it leeds to a surprising parallelism with symplectic geometry.\u00a0<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 12pt;\"><strong>Wednesday 01\/04\/2026 16:00-18:15 :<\/strong> <i>Tame geometry over valued fields<\/i><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt;\">Abstract: Over the reals, o-minimal structures provide a general framework to develop tame geometry. We will start by presenting a general overview of this theory, focusing on applications to number geometry, before presenting some of the non-archimedean analogues obtained in recent years.<\/span><\/p>\n<p><strong><span style=\"font-size: medium;\">Fran\u00e7ois Loeser is also the holder of the second edition of the Jacques Tits Chair, awarded by the Belgian Mathematical Society.<\/span><\/strong><\/p>\n<p><u> <\/u> <strong><span style=\"font-size: medium;\"><u>More information : christian.michaux@umons.ac.be<\/u><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>FRANCQUI Chair |2025&#8211;2026 | Professor Fran\u00e7ois Loeser Institut de Math\u00e9matiques de Jussieu-Paris Rive Gauche A Francqui Chair has been awarded by the FRANCQUI Foundation to Professor Fran\u00e7ois Loeser; He will visit Belgium during -the month of March and at the beginning of April. He will deliver a series of lectures that may be attended independently [&hellip;]<\/p>\n","protected":false},"author":147,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-408","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chaire Francqui 2025-2026 - FS - D\u00e9partement de math\u00e9matique<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chaire Francqui 2025-2026 - FS - D\u00e9partement de math\u00e9matique\" \/>\n<meta property=\"og:description\" content=\"FRANCQUI Chair |2025&#8211;2026 | Professor Fran\u00e7ois Loeser Institut de Math\u00e9matiques de Jussieu-Paris Rive Gauche A Francqui Chair has been awarded by the FRANCQUI Foundation to Professor Fran\u00e7ois Loeser; He will visit Belgium during -the month of March and at the beginning of April. He will deliver a series of lectures that may be attended independently [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/\" \/>\n<meta property=\"og:site_name\" content=\"FS - D\u00e9partement de math\u00e9matique\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-10T16:16:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/210\/2026\/01\/header.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/\",\"url\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/\",\"name\":\"Chaire Francqui 2025-2026 - FS - D\u00e9partement de math\u00e9matique\",\"isPartOf\":{\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/210\/2026\/01\/header.jpg\",\"datePublished\":\"2026-01-22T09:14:34+00:00\",\"dateModified\":\"2026-03-10T16:16:01+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/#primaryimage\",\"url\":\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/210\/2026\/01\/header.jpg\",\"contentUrl\":\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/210\/2026\/01\/header.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Chaire Francqui 2025-2026\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/#website\",\"url\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/\",\"name\":\"FS - D\u00e9partement de math\u00e9matique\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/web.umons.ac.be\/fs-mathematique\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Chaire Francqui 2025-2026 - FS - D\u00e9partement de math\u00e9matique","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/web.umons.ac.be\/fs-mathematique\/chaire-francqui25-26\/","og_locale":"fr_FR","og_type":"article","og_title":"Chaire Francqui 2025-2026 - FS - D\u00e9partement de math\u00e9matique","og_description":"FRANCQUI Chair |2025&#8211;2026 | Professor Fran\u00e7ois Loeser Institut de Math\u00e9matiques de Jussieu-Paris Rive Gauche A Francqui Chair has been awarded by the FRANCQUI Foundation to Professor Fran\u00e7ois Loeser; He will visit Belgium during -the month of March and at the beginning of April. 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