{"id":17072,"date":"2026-09-21T19:58:26","date_gmt":"2026-09-22T00:58:26","guid":{"rendered":"https:\/\/uwm.edu\/math\/?post_type=tribe_events&#038;p=17072"},"modified":"2026-09-21T19:58:26","modified_gmt":"2026-09-22T00:58:26","slug":"colloquium-dr-nicholas-mayers","status":"publish","type":"tribe_events","link":"https:\/\/uwm.edu\/math\/event\/colloquium-dr-nicholas-mayers\/","title":{"rendered":"Colloquium: Dr. Nicholas Mayers"},"content":{"rendered":"<h2><span data-olk-copy-source=\"MailCompose\">The combinatorics of seaweed algebras<\/span><\/h2>\n<div data-olk-copy-source=\"MailCompose\">Seaweed algebras form a class of Lie algebras for which a number of algebraic invariants can be computed combinatorially. One such invariant is the index, an important algebraic invariant which is notoriously difficult to compute. Defining seaweed algebras originally as subalgebras of gl(n), Dergachev and Kirillov found that their index could be computed combinatorially by counting paths and cycles in a corresponding planar graph called a meander. Since then, the notion of a seaweed algebra has been extended to the classical Lie algebras (types A, B, C, and D), and the likewise extended notion of their associated meanders have been shown to hold much algebraic information. The goal of this talk is to give a tour of these combinatorial results over both gl(n) as well as the classical types. No prior knowledge is necessary for this talk. Open problems will be sprinkled throughout.<\/div>\n<div data-olk-copy-source=\"MailCompose\"><\/div>\n<div>For more information:<\/div>\n<div><a class=\"x1i10hfl xjbqb8w x1ejq31n x18oe1m7 x1sy0etr xstzfhl x972fbf x10w94by x1qhh985 x14e42zd x9f619 x1ypdohk xt0psk2 x3ct3a4 xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x16tdsg8 x1hl2dhg xggy1nq x1a2a7pz xkrqix3 x1sur9pj x1fey0fg x1s688f OWAAutoLink\" href=\"https:\/\/sites.google.com\/view\/nmayers?pli=1&amp;authuser=0&amp;fbclid=IwcGRvZgFleHRuA2FlbQIxMABicmlkETFKZE4xVnNoSXllbWVaY2c2c3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHrl5kF8tLdAdqLR-OpAzUlFEfmDldpm5WTzHAilWkmxHSwp-2Ub-iX6o3RA2_aem_sAq_tVvFgofkyXKdL-9HVQ\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/sites.google.com\/view\/nmayers?pli=1&amp;authuser=0<\/a><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The combinatorics of seaweed algebras Seaweed algebras form a class of Lie algebras for which a number of algebraic invariants can be computed combinatorially. One such invariant is the index, an important algebraic invariant which is notoriously difficult to compute. &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-17072","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-nicholas-mayers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Colloquium: Dr. Nicholas Mayers\" \/>\n<meta property=\"og:description\" content=\"The combinatorics of seaweed algebras Seaweed algebras form a class of Lie algebras for which a number of algebraic invariants can be computed combinatorially. One such invariant is the index, an important algebraic invariant which is notoriously difficult to compute. &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uwm.edu\/math\/event\/colloquium-dr-nicholas-mayers\/\" \/>\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-nicholas-mayers\\\/\",\"url\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-nicholas-mayers\\\/\",\"name\":\"Colloquium: Dr. Nicholas Mayers - Mathematical Sciences\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/#website\"},\"datePublished\":\"2026-09-22T00:58:26+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-nicholas-mayers\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-nicholas-mayers\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/math\\\/event\\\/colloquium-dr-nicholas-mayers\\\/#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. Nicholas Mayers\"}]},{\"@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-nicholas-mayers\/","og_locale":"en_US","og_type":"article","og_title":"Colloquium: Dr. Nicholas Mayers","og_description":"The combinatorics of seaweed algebras Seaweed algebras form a class of Lie algebras for which a number of algebraic invariants can be computed combinatorially. 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