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Proof step 13 from proof validref-put-samefield-01 (conclusion)

⊦ is_valid_ref(r, st) ∧ oktype(val, fs .type, st) ∧ fs ' ≠ _length ∧ fs ' ≠ _type → is_valid_ref(r, st[r -- fs ', val])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
oktype(val, fs .type, st), is_valid_ref(r, st) ⊦ fs ' = _length, fs ' = _type, is_valid_ref(r, st[r -- fs ', val])

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]