Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleNecessity and contingency.AuthorsCresswell, M.AbstractThe paper considers the question of when the operator L of necessity in modal logic can be expressed in terms of the operator Δ meaning 'it is non-contingent that'.PublicationStudia Logica, 1988, Vol 47, Issue 2, p145ISSN0039-3215Publication typeArticleDOI10.1007/BF00370288