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Proof step 4 from proof rest (previous step)

∀ a0. #oc(a0, a ') ≤ #oc(a0, b ') ⊦ a = b

User applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: a abort: F discard: F computed: F

Additional information

Used simplifier rules: one: ⊦ #oc(a, a ') = 1;%one-01: ⊦ a ≠ b → #oc(a, b ') = 0; Used terms: a