Див. «A Priori and A Posteriori» (author: Jason S. Baehr), at Internet Encyclopedia of Philosophy [Архівовано 9 березня 2010 у Wayback Machine.]: "A necessary proposition is one the truth value of which remains constant across all possible worlds.
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Див. «A Priori and A Posteriori» (author: Jason S. Baehr), at Internet Encyclopedia of Philosophy [Архівовано 9 березня 2010 у Wayback Machine.]: "A necessary proposition is one the truth value of which remains constant across all possible worlds.