{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T15:45:34Z","timestamp":1765295134992},"reference-count":0,"publisher":"EasyChair","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>We propose a number of powerful dynamic-epistemic logics for multi-agent information sharing and acts of publicly or privately accessing other agents\u2019 information databases. The static base of our logics is obtained by adding to standard epistemic logic comparative epistemic assertions for groups or individuals, as well as a common distributed knowledge operator (that combines features of both common knowledge and distributed knowledge). On the dynamic side, we introduce actions by which epistemic superiority can be acquired: \u201csharing all one knows\u201d (by e.g. giving access to one\u2019s information database to all or some of the other agents), as well as more complex informational events, such as hacking. We completely axiomatize several such logics and prove their decidability.<\/jats:p>","DOI":"10.29007\/plm4","type":"proceedings-article","created":{"date-parts":[[2020,5,27]],"date-time":"2020-05-27T22:10:11Z","timestamp":1590617411000},"source":"Crossref","is-referenced-by-count":10,"title":["Learning What Others Know"],"prefix":"10.29007","author":[{"given":"Alexandru","family":"Baltag","sequence":"first","affiliation":[]},{"given":"Sonja","family":"Smets","sequence":"additional","affiliation":[]}],"member":"11545","event":{"name":"LPAR23. LPAR-23: 23rd International Conference on Logic for Programming, Artificial Intelligence and Reasoning"},"container-title":["EPiC Series in Computing"],"original-title":[],"deposited":{"date-parts":[[2020,5,27]],"date-time":"2020-05-27T22:10:15Z","timestamp":1590617415000},"score":1,"resource":{"primary":{"URL":"https:\/\/easychair.org\/publications\/paper\/V8Jp"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[null]]},"references-count":0,"URL":"https:\/\/doi.org\/10.29007\/plm4","relation":{},"ISSN":["2398-7340"],"issn-type":[{"value":"2398-7340","type":"print"}],"subject":[]}}