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Proof step 63 from proof validrefs-putbyte-01 (conclusion)

⊦ okbytearray(r, st) ∧ ¬ validrefs(str, refs, ty, st) → ¬ validrefs(str, refs, ty, st[r -- i ', byteval(by)])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 62:
okbytearray(r, st), validrefs(str, refs, ty, st[r -- i ', byteval(by)]) ⊦ validrefs(str, refs, ty, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]