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Proof step 1 from proof sis-neg-lower (conclusion)

⊦ i < ~32768 ∧ ~65536 < i → s2i(i2s(i)) = i + 65536

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
i < ~32768, ~65536 < i, i < 0 ⊦ s2i(i2s(i)) = i + 65536

Rule argument

Additional information

Used simplifier rules: ⊦ i < (* j) ∧ j < 0 → i < 0; (forward)