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Proof step 15 from proof mod-square-10 (previous step)

i * i = j * 10, ∃ i0. 2 * i0 = i ⊦ i % 10 = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 16:
4 * i0 * i0 = j * 10 ⊦ (2 * i0) % 10 = 0

Rule argument

Additional information

Used simplifier rules: commutativity: ⊦ i * j = j * i; from specification int-mult%associativity: ⊦ i * j * j0 = (i * j) * j0; from specification int-mult