{"id":3683,"date":"2019-01-11T20:46:36","date_gmt":"2019-01-11T19:46:36","guid":{"rendered":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/?p=3683"},"modified":"2019-01-21T21:52:26","modified_gmt":"2019-01-21T20:52:26","slug":"lira-session-dag-westerstahl","status":"publish","type":"post","link":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/2019\/01\/lira-session-dag-westerstahl\/","title":{"rendered":"LIRa Session: Dag Westerstahl"},"content":{"rendered":"<p>Speaker: <a href=\"https:\/\/www.philosophy.su.se\/english\/research\/our-researchers\/faculty\/dag-westerst%C3%A5hl-1.165620\">Dag Westerstahl<\/a><\/p>\n<p>Date and Time: Monday, January&nbsp;28th 2019, 16:30-18:00<\/p>\n<p>Venue: ILLC Seminar Room F1.15, Science Park 107.<\/p>\n<p><strong>Title: Logicality revisited: constants vs. consequence.<\/strong><\/p>\n<p><em>Abstract. <\/em>There is an abstract Galois duality between (sets of) constants and consequence relations that I will explore, and argue that it gives some insight into both notions, and in particular into the notion of a logical constant. This leads in a natural way to a question posed already by Carnap in 1943, but rather neglected since: To what extent do the properties of a logical consequence relation fix the meaning of the logical constants in the language? Carnap asked this about classical propositional logic, but the question makes sense for any logic. It has a precise and satisfactory answer for propositional and first-order logic, which I will state, and then go on to ask Carnap\u2019s question for modal logic. The situation there is similar to, but also interestingly different from, that in first-order logic, and some new conceptual issues, and some mildly interesting facts, arise. In particular, we get a new perspective on neighborhood semantics for modal logic. This is joint work with Denis Bonnay.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Speaker: Dag Westerstahl<br \/>\nDate and Time: Monday, January&nbsp;28th 2019, 16:30-18:00<br \/>\nVenue: ILLC Seminar Room F1.15, Science Park 107.<br \/>\nTitle: Logicality revisited: constants vs. consequence.<br \/>\nAbstract. There is an abstract Galois duality between (sets of) constants and consequence relations that I will explore, and argue that it gives some insight into both notions, and in particular into the notion of [&#8230;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-3683","post","type-post","status-publish","format-standard","hentry","category-events"],"_links":{"self":[{"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/posts\/3683","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/comments?post=3683"}],"version-history":[{"count":3,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/posts\/3683\/revisions"}],"predecessor-version":[{"id":3694,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/posts\/3683\/revisions\/3694"}],"wp:attachment":[{"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/media?parent=3683"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/categories?post=3683"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/tags?post=3683"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}