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Proof step 3 from proof rm-allsize (previous step)

∀ a. ¬ a ∈ y ⊦ y = []

User applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: y.first abort: F discard: F computed: F

Additional information

Used simplifier rules: in-08: ⊦ x.first ∈ x ↔ x ≠ []; from specification list Used terms: y.first