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Proof step 23 from proof pathex-trans (previous step)

∃ refs. refs ≠ [] ∧ refs .first = r0 ∧ refs .last = r1 ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st), path∃(str, r, r0, st) ⊦ path∃(str, r, r1, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 22:
validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st), path∃(str, r, refs .first, st) ⊦ refs = [], path∃(str, r, refs .last, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]