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Proof step 56 from proof inv-format (previous step)

⊦ ∃ err0. ⌊err0⌋

Heuristic use patterns applied rule exists right

And closed the goal!

Rule argument

pos: right 1 terms: EFAIL abort: T discard: F computed: F

Additional information

Used simplifier rules: ⊦ ⌊EFAIL⌋ ; (s) Used terms: EFAIL