{"id":17085,"date":"2026-09-24T13:54:47","date_gmt":"2026-09-24T18:54:47","guid":{"rendered":"https:\/\/uwm.edu\/math\/?post_type=tribe_events&#038;p=17085"},"modified":"2026-09-24T13:54:47","modified_gmt":"2026-09-24T18:54:47","slug":"colloquium-dr-jonah-gaster","status":"publish","type":"tribe_events","link":"https:\/\/uwm.edu\/math\/event\/colloquium-dr-jonah-gaster\/","title":{"rendered":"Colloquium: Dr. Jonah Gaster"},"content":{"rendered":"<h2>SIMPLE CLOSED GEODESICS ON HYPERBOLIC<br \/>\nSURFACES<\/h2>\n<div data-olk-copy-source=\"MailCompose\">Many of the 21st century spectacular advances in geometry and topology involve the study of simple closed geodesics on hyperbolic surfaces (Thurston, Mirzakhani, etc). I will tell you about one difficult little aspect of this story that I&#8217;ve been thinking about recently: How many simple closed geodesics on a hyperbolic surface may have precisely the same length? I will sketch some of the background ideas that indicate why this question is deep, and related to other things that sound like they have nothing to do with hyperbolic geometry (like modular curves, Diophantine approximation, and solutions to polynomial equations).<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SIMPLE CLOSED GEODESICS ON HYPERBOLIC SURFACES Many of the 21st century spectacular advances in geometry and topology involve the study of simple closed geodesics on hyperbolic surfaces (Thurston, Mirzakhani, etc). I will tell you about one difficult little aspect of &hellip;<\/p>\n","protected":false},"author":30596,"featured_media":0,"template":"","meta":{"_acf_changed":false,"_tribe_events_status":"","_tribe_events_status_reason":"","_tribe_events_is_hybrid":"","_tribe_events_is_virtual":"","_tribe_events_virtual_video_source":"","_tribe_events_virtual_embed_video":"","_tribe_events_virtual_linked_button_text":"","_tribe_events_virtual_linked_button":"","_tribe_events_virtual_show_embed_at":"","_tribe_events_virtual_show_embed_to":[],"_tribe_events_virtual_show_on_event":"","_tribe_events_virtual_show_on_views":"","_tribe_events_virtual_url":"","footnotes":"","uwm_wg_additional_authors":[]},"tags":[],"tribe_events_cat":[41],"class_list":["post-17085","tribe_events","type-tribe_events","status-publish","hentry","tribe_events_cat-colloquia","cat_colloquia"],"uwm_unpublish_requested":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mathematical Sciences<\/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:\/\/uwm.edu\/math\/event\/colloquium-dr-jonah-gaster\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Colloquium: Dr. Jonah Gaster\" \/>\n<meta property=\"og:description\" content=\"SIMPLE CLOSED GEODESICS ON HYPERBOLIC SURFACES Many of the 21st century spectacular advances in geometry and topology involve the study of simple closed geodesics on hyperbolic surfaces (Thurston, Mirzakhani, etc). I will tell you about one difficult little aspect of &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uwm.edu\/math\/event\/colloquium-dr-jonah-gaster\/\" \/>\n<meta property=\"og:site_name\" content=\"Mathematical Sciences\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-jonah-gaster\\\/\",\"url\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-jonah-gaster\\\/\",\"name\":\"Colloquium: Dr. Jonah Gaster - Mathematical Sciences\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/#website\"},\"datePublished\":\"2026-09-24T18:54:47+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-jonah-gaster\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-jonah-gaster\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-jonah-gaster\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\",\"item\":\"https:\\\/\\\/uwm.edu\\\/math\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Events\",\"item\":\"https:\\\/\\\/uwm.edu\\\/math\\\/events\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Colloquia\",\"item\":\"https:\\\/\\\/uwm.edu\\\/math\\\/events\\\/category\\\/colloquia\\\/\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Colloquium: Dr. Jonah Gaster\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/#website\",\"url\":\"https:\\\/\\\/uwm.edu\\\/math\\\/\",\"name\":\"Mathematical Sciences\",\"description\":\"UW-Milwaukee\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/uwm.edu\\\/math\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Mathematical Sciences","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:\/\/uwm.edu\/math\/event\/colloquium-dr-jonah-gaster\/","og_locale":"en_US","og_type":"article","og_title":"Colloquium: Dr. Jonah Gaster","og_description":"SIMPLE CLOSED GEODESICS ON HYPERBOLIC SURFACES Many of the 21st century spectacular advances in geometry and topology involve the study of simple closed geodesics on hyperbolic surfaces (Thurston, Mirzakhani, etc). 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