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    Mathematical truths are necessary, not contingent. P=NP h... — Carmelics
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    Challenges→The inference from 'a polynomial algorithm exists for one NP-complete problem' to 'polynomial algorithms exist for all NP problems' treats existence as a transferable property, but Kripkean possible-worlds semantics demands we specify in which worlds and under which interpretations such algorithms exist.

    Mathematical truths are necessary, not contingent. P=NP has a determinate truth-value independent of possible worlds; Kripkean semantics doesn't apply.

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