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Proof step 4 from proof lookup-last-rec (previous step)

∀ st, r, sk. st[r -- (sks0 + sk ')] = st[st[r -- sks0] .refval -- sk] ⊦ sks0 = [], st[st[r -- sk0] .refval -- (sks0 + sk ')] = st[st[st[r -- sk0] .refval -- sks0] .refval -- sk]

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 1, [QUANTTERMLIST : (st, st[r -- sk0] .refval, sk)]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, st[r -- sk0] .refval, sk)]]