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Proof step 1 from proof k-Del-rec1 (conclusion)

⊦ ¬ a ∈ st → st[a, d] -- a = st

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: insert: ⊦ st[a, d] -- a = st -- a;%notin-del-notin: ⊦ ¬ a ∈ st → st -- a = st;