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Proof step 3 from proof mod-two-pred-02 (previous step)

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

User applied rule insert equation

And obtained the following new goals

Proof step 4:
i < 0 ⊦ ~(2 * i - 1) % 2 = 1

Rule argument

pos: left 1 flags: discard

Additional information