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  1. Logical and Analytic Truths That Are Not Necessary.Edward N. Zalta - 1988 - Journal of Philosophy 85 (2):57-74.
    The author describes an interpreted modal language and produces some clear examples of logical and analytic truths that are not necessary. These examples: (a) are far simpler than the ones cited in the literature, (b) show that a popular conception of logical truth in modal languages is incorrect, and (c) show that there are contingent truths knowable ``a priori'' that do not depend on fixing the reference of a term.
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  • De Jure and De Facto Validity in the Logic of Time and Modality.Stephan Leuenberger - 2013 - Thought: A Journal of Philosophy 2 (2):196-205.
    What formulas are tense-logically valid depends on the structure of time, for example on whether it has a beginning. Logicians have investigated what formulas correspond to what physical hypotheses about time. Analogously, we can investigate what formulas of modal logic correspond to what metaphysical hypotheses about necessity. It is widely held that physical hypotheses about time may be contingent. If so, tense-logical validity may be contingent. In contrast, validity in modal logic is typically taken to be non-contingent, as reflected by (...)
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  • Logical and Analytic Truths That Are Not Necessary.Edward N. Zalta - 1988 - Journal of Philosophy 85 (2):57-74.
    After defining a standard modal language and semantics, we offer some clear examples of logical and analytic truths that are not necessary. These examples: (a) are far simpler than the ones cited in the literature, (b) show that a popular conception of logical truth in modal languages is incorrect, and (c) show that there are contingent truths knowable ``a priori'' that do not depend on fixing the reference of a term.
     
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