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Proof step 1 from proof div2-zero (conclusion)

⊦ i / 2 = 0 ↔ i = 0 ∨ i = 1 ∨ i = ~ 1

User applied rule case distinction

And obtained the following new goals

Proof step 2:
i / 2 = 0 ⊦ i = 0 ∨ i = 1 ∨ i = ~ 1

Rule argument

pos: right 1

Additional information