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Proof step 2 from proof square-even-02 (previous step)

(i + 1) * (i + 2) = (i + 1) * ((i + 1) + 1) ⊦ ((i + 1) * (i + 2)) % 2 = 0

User applied rule insert equation

And obtained the following new goals

Proof step 3:
⊦ ((i + 1) * ((i + 1) + 1)) % 2 = 0

Rule argument

pos: left 1 flags: discard

Additional information