{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T11:19:42Z","timestamp":1778757582077,"version":"3.51.4"},"edition-number":"1","reference-count":0,"publisher":"Cambridge University Press","isbn-type":[{"value":"9780521295154","type":"print"},{"value":"9780521224765","type":"print"},{"value":"9780511621192","type":"electronic"}],"license":[{"start":{"date-parts":[[2012,6,5]],"date-time":"2012-06-05T00:00:00Z","timestamp":1338854400000},"content-version":"unspecified","delay-in-days":11785,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1980,2,29]]},"abstract":"<jats:p>A textbook on modal logic, intended for readers already acquainted with the elements of formal logic, containing nearly 500 exercises. Brian F. Chellas provides a systematic introduction to the principal ideas and results in contemporary treatments of modality, including theorems on completeness and decidability. Illustrative chapters focus on deontic logic and conditionality. Modality is a rapidly expanding branch of logic, and familiarity with the subject is now regarded as a necessary part of every philosopher's technical equipment. Chellas here offers an up-to-date and reliable guide essential for the student.<\/jats:p>","DOI":"10.1017\/cbo9780511621192","type":"monograph","created":{"date-parts":[[2012,6,15]],"date-time":"2012-06-15T17:57:19Z","timestamp":1339783039000},"source":"Crossref","is-referenced-by-count":1281,"title":["Modal Logic"],"prefix":"10.1017","author":[{"given":"Brian F.","family":"Chellas","sequence":"first","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2012,6,5]]},"container-title":[],"original-title":[],"deposited":{"date-parts":[[2022,10,13]],"date-time":"2022-10-13T22:18:29Z","timestamp":1665699509000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/9780511621192\/type\/book"}},"subtitle":["An Introduction"],"short-title":[],"issued":{"date-parts":[[1980,2,29]]},"ISBN":["9780521295154","9780521224765","9780511621192"],"references-count":0,"URL":"https:\/\/doi.org\/10.1017\/cbo9780511621192","relation":{},"subject":[],"published":{"date-parts":[[1980,2,29]]}}}