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Proof step 9 from proof mod-square-10 (previous step)

i * i = j * 10, 2 | j * 10 ⊦ i % 10 = 0

User applied rule insert equation

And obtained the following new goals

Proof step 10:
i * i = j * 10, 2 | i * i ⊦ i % 10 = 0

Rule argument

pos: left 1 flags: rotate

Additional information