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Proof step 5 from proof validstatfields-levelsubset (previous step)

level⊆(str, str0), validstatfield(str, sk, st), validstatfields(str, sks0, st), ∀ str, str0, st. level⊆(str, str0) ∧ validstatfields(str, sks0, st) → validstatfields(str0, sks0, st) ⊦ validstatfields(str0, sks0, st)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 4, [QUANTTERMLIST : (str, str0, st)]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, str0, st)]]