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Proof step 13 from proof unchanged-pathex (previous step)

validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st), unchanged(str, refs .first, st, st1) ⊦ refs = [], refs ≠ [] ∧ refs .first = refs .first ∧ refs .last = refs .last ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st), unchanged(str, refs .first, st, st1) ⊦ refs = [], validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st1)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]