Ideas from 'A Priori Knowledge Revisited' by Philip Kitcher [2000], by Theme Structure

[found in 'New Essays on the A Priori' (ed/tr Boghossian,P /Peacocke,C) [OUP 2000,0-19-924127-9]].

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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
Classical logic is our preconditions for assessing empirical evidence
I believe classical logic because I was taught it and use it, but it could be undermined
10. Modality / D. Knowledge of Modality / 1. A Priori Necessary
Knowing our own existence is a priori, but not necessary
Many necessities are inexpressible, and unknowable a priori