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Proof step 15 from proof long-is-cast (previous step)

# int2bits(i) ≤ 64 ⊦ l2i(i2l(bits2int(lastn(64, int2bits(i))))) = cast(64, i), ~(2 ^ 63) ≤ i ∧ i ≤ 2 ^ 63 - 1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ ¬ i ≤ j ↔ j < i;