{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T03:23:51Z","timestamp":1774927431832,"version":"3.50.1"},"reference-count":35,"publisher":"Cambridge University Press (CUP)","issue":"4","license":[{"start":{"date-parts":[[2025,8,26]],"date-time":"2025-08-26T00:00:00Z","timestamp":1756166400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["cambridge.org"],"crossmark-restriction":true},"short-container-title":["The Review of Symbolic Logic"],"published-print":{"date-parts":[[2025,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>This paper makes a twofold contribution to the study of expressivity. First, we introduce and study the novel concept of conditional expressivity. Taking a universal logic perspective, we characterize conditional expressivity both syntactically and semantically. We show that our concept of conditional expressivity is related to, but different from, the concept of explicit definability in Beth\u2019s definability theorem. Second, we use the concept to explore inferential relations between collective deontic admissibility statements for different groups. Negative results on conditional expressivity are stronger than standard (unconditional) inexpressivity results: we show that the well-known inexpressivity results from epistemic logic on distributed knowledge and on common knowledge only concern unconditional expressivity. By contrast, we prove negative results on conditional expressivity in the deontic logic of collective agency. In particular, we consider the full formal language of the deontic logic of collective\u00a0agency, define a natural class of sublanguages of the full language, and prove that a\u00a0collective deontic admissibility statement about a particular group is conditionally expressible in a sublanguage from the class if and only if that sublanguage includes a collective deontic admissibility statement about a supergroup of that group. Our negative results on conditional expressivity may serve as a proof of concept for future studies.<\/jats:p>","DOI":"10.1017\/s1755020325100798","type":"journal-article","created":{"date-parts":[[2025,8,26]],"date-time":"2025-08-26T00:32:12Z","timestamp":1756168332000},"page":"991-1011","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":0,"title":["CONDITIONAL EXPRESSIVITY AND COLLECTIVE DEONTIC ADMISSIBILITY"],"prefix":"10.1017","volume":"18","author":[{"given":"FREDERIK","family":"VAN DE PUTTE","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/057w15z03","id-type":"ROR","asserted-by":"publisher"}],"name":"ERASMUS UNIVERSITY ROTTERDAM"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"HEIN","family":"DUIJF","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04pp8hn57","id-type":"ROR","asserted-by":"publisher"}],"name":"UTRECHT 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Published by Cambridge University Press on behalf of The Association for Symbolic Logic","name":"copyright","label":"Copyright","group":{"name":"copyright_and_licensing","label":"Copyright and Licensing"}},{"value":"This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https:\/\/creativecommons.org\/licenses\/by\/4.0\/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.","name":"license","label":"License","group":{"name":"copyright_and_licensing","label":"Copyright and Licensing"}},{"value":"This content has been made available to all.","name":"free","label":"Free to read"}]}}