{"id":1790,"date":"2013-01-28T21:18:16","date_gmt":"2013-01-28T20:18:16","guid":{"rendered":"http:\/\/www.illc.uva.nl\/lgc\/seminar\/?p=1790"},"modified":"2015-10-06T15:00:11","modified_gmt":"2015-10-06T13:00:11","slug":"lira-session-roberto-ciuni-2","status":"publish","type":"post","link":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/2013\/01\/lira-session-roberto-ciuni-2\/","title":{"rendered":"LIRa session: Roberto Ciuni"},"content":{"rendered":"<p>On February 7, at <strong>16:15 <\/strong>we will have a LIRa session with Roberto Ciuni.<\/p>\n<p><strong>Please note that the time of the talk is 16:15-18:00 and not our usual time-slot.<\/strong><\/p>\n<div>\n<p>Everyone is cordially invited!<\/p>\n<p>Speaker:\u00a0<strong>Roberto Ciuni<\/strong>, (Ruhr University Bochum)<br \/>\nTitle:\u00a0<strong>Completeness of a Group STIT with Next Operator<\/strong><br \/>\nDate and Time: Thursday, February 7, 2013,\u00a0<strong>16:15-18:00<\/strong><br \/>\nVenue: Science Park 904, Room\u00a0<strong>D1.115<\/strong><br \/>\nAbstract:<\/p>\n<div>Group STIT logics are raising some interest in the logical modelling of multi-agent systems, due to their ability to express what agents do when they combine their individual efforts and form a group (or coalition).<\/div>\n<div>As usual with STIT logics, they are interpreted on trees endowed with a &#8216;choice function&#8217; and a non-empty set of agents. Temporal STIT logics are also raising some interest, since some form of temporal expressivity is essential to express non-instantaneous agency (cases where there is a temporal hyatus between the action and the outcome). Here I present a group STIT logic which combines Chellas&#8217; stit operators [A] for group agency with a `next&#8217; operator X. The logic is interpreted on a class of structures which I call choice<br \/>\nT x W frames and. I show that the logic is complete relative to T x W frames by applying the Sahlqvist techniques. The interesting point is that Sahlqvist techniques are not directly applicable to choice T x W frames. A key part in the strategy of the completeness proof is then proving an isomorphism between the frames and the structures generated by the Sahlqvist axioms I present as a Hilbert system for the logic. I then add some reamarks over the distinction between additive and superadditive frames, the impact of additivity on completeness, and the connection between additivity and permutation.<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>On February 7, at 16:15 we will have a LIRa session with Roberto Ciuni.<br \/>\nPlease note that the time of the talk is 16:15-18:00 and not our usual time-slot.<\/p>\n<p>Everyone is cordially invited!<br \/>\nSpeaker:\u00a0Roberto Ciuni, (Ruhr University Bochum)<br \/>\nTitle:\u00a0Completeness of a Group STIT with Next Operator<br \/>\nDate and Time: Thursday, February 7, 2013,\u00a016:15-18:00<br \/>\nVenue: Science Park 904, Room\u00a0D1.115<br \/>\nAbstract:<br \/>\nGroup STIT logics are [&#8230;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1790","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\/1790","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\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/comments?post=1790"}],"version-history":[{"count":14,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/posts\/1790\/revisions"}],"predecessor-version":[{"id":1830,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/posts\/1790\/revisions\/1830"}],"wp:attachment":[{"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/media?parent=1790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/categories?post=1790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projects.illc.uva.nl\/lgc\/seminar\/wp-json\/wp\/v2\/tags?post=1790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}