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Proof step 9 from proof cast-law-absorption (previous step)

lastn(i→n(i0), fillsgn(i→n(i0), int2bits(j))) ≠ [], i ≤ i0, 0 < i, 0 < i0 ⊦ bits2int(lastn(i→n(i), fillsgn(i→n(i), lastn(i→n(i0), fillsgn(i→n(i0), int2bits(j)))))) = cast(i, j)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ i→n(i) = 0 ↔ i = 0;% ⊦ lastn(n, bits) = [] ↔ n = 0;