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Proof step 1 from proof mod-next-square (conclusion)

⊦ ((i * i) * (i + 1) * (i + 1)) % 4 = 0

User applied rule cut formula

And obtained the following new goals

Proof step 2:
i % 2 = 0 ⊦ ((i * i) * (i + 1) * (i + 1)) % 4 = 0
Proof step 4:
⊦ i % 2 = 0, ((i * i) * (i + 1) * (i + 1)) % 4 = 0

Rule argument

fma: i % 2 = 0

Additional information

Used formulas: i % 2 = 0