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Proof step 7 from proof pathex-subset (previous step)

validref(str, r, ty, st), st ⊆ st0, validrefs(str, r ' + refs0, mkclasstype(`java.lang.Object' .class), st) ⊦ ∃ refs. refs ≠ [] ∧ refs .first = r ∧ refs .last = (r ' + refs0) .last ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
validref(str, r, ty, st), st ⊆ st0, validrefs(str, r ' + refs0, mkclasstype(`java.lang.Object' .class), st) ⊦ ∃ refs. refs ≠ [] ∧ refs .first = r ∧ refs .last = (refs .first ' + refs0) .last ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st0)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]