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Proof step 13 from proof subrec (previous step)

#oc(a0, y -1l a) < #oc(a0, x), a0 ∈ x, ∀ a0. #oc(a0, a ') + #oc(a0, x) ≤ #oc(a0, y) ⊦

User applied rule all left

And obtained the following new goals

Proof step 14:
#oc(a0, y -1l a) < #oc(a0, x), a0 ∈ x, #oc(a0, a ') + #oc(a0, x) ≤ #oc(a0, y) ⊦

Rule argument

pos: left 3 terms: a0 abort: F discard: T computed: F

Additional information

Used terms: a0