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Proof step 3 from proof validfieldlist-rec (previous step)

sk0 = sk ∨ sk0 ∈ sks → validfield(str, r, sk0, st), ∀ sk0. sk0 = sk ∨ sk0 ∈ sks → validfield(str, r, sk0, st) ⊦ validfield(str, r, sk, st)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 2, [QUANTTERMLIST : (sk)]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (sk)]]