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Prove that succFinitePos and predFinitePos are inverse (#249)

- also merge the zero + denormal branches in ValidFinite
- also update some comments
- also rearrange some of the existing lemmas
U
Ulf Adams committed
3377662b1958dbdefb679e2c110368512cccf4f6
Parent: 6fbbca4
Committed by GitHub <noreply@github.com> on 1/10/2026, 12:04:06 PM