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Proof step 3 from proof div2-odd-01 (previous step)

1 - i * 2 = ~ i * 2 + 1, i < 0 ⊦ i + (1 - i * 2) / 2 = 0

User applied rule insert equation

And obtained the following new goals

Proof step 4:
i < 0 ⊦ i + (~ i * 2 + 1) / 2 = 0

Rule argument

pos: left 1 flags: discard

Additional information