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Proof step 5 from proof validfieldlist-superset (previous step)

validfieldlist(str, r, sks0, st), validfield(str, r, sk, st), st ⊆ st0, ∀ str, r, st, st0. validfieldlist(str, r, sks0, st) ∧ st ⊆ st0 → validfieldlist(str, r, sks0, st0) ⊦ validfieldlist(str, r, sks0, st0)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

[EXRARG : pos: left 4, [QUANTTERMLIST : (str, r, st, st0)]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, r, st, st0)]]