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Proof step 3 from proof validFields-del (previous step)

validFields(r, fis0, st -- rk), r -- sk ∈ st, r ∈ st, ∀ r, st, rk. validFields(r, fis0, st -- rk) → validFields(r, fis0, st) ⊦ r -- sk = rk, sk = _type, sk = _length, sk ∈ fis0, validFields(r, fis0, st)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

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

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r, st, rk)]]