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Proof step 5 from proof one-less (previous step)

0 +1 = 1 ⊦ 1 < i0 +1 ↔ 0 < i0

User applied rule insert equation

And obtained the following new goals

Proof step 6:
⊦ 0 +1 < i0 +1 ↔ 0 < i0

Rule argument

pos: left 1 flags: rotate, discard

Additional information