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Proof step 4 from proof newrefs-butlast (conclusion)

⊦ ¬ newref_list(n + 1, st) .last ∈ newref_list(n + 1, st) .butlast

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ newref_list(n + 1, st) .butlast = newref_list(n, st)
Proof step 3:
⊦ ¬ newref_list(n + 1, st) .last ∈ newref_list(n, st)

Rule argument

[crewrite-arg: newrefs-butlast-01, F, [st, n] → [st, n]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, n)]]