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Defeasibilist: "We don't really know that 2+3=5"

One response: that we know WHAT "2+3=5" means (while prescinding from the discussion of whether we know that it is or must be true) is sufficient to make manifest the fact that we have access to transcendent, Platonic objects.  What I think of when I say this is at least as obvious as what I see when I open my eyes.

In order to disagree about whether a claim is true one must agree (at least in part) about what the utterance of the claim means.

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