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Proof step 4 from proof get-last-01 (previous step)

∀ a. (a ' + x0)[# x0] = (a ' + x0).last ⊦ (a0 ' + x0)[# x0] = (a0 ' + x0).last

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: a0

Additional information

Used terms: a0