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Proof step 19 from proof pathex-trans (previous step)

path∃(str, r, r0, st), validrefs(str, r0 ' + refs0, mkclasstype(`java.lang.Object' .class), st) ⊦ refs0 = [], path∃(str, r, (r0 ' + refs0) .last, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 18:
path∃(str, r, r0, st), validrefs(str, r0 ' + refs0, mkclasstype(`java.lang.Object' .class), st) ⊦ refs0 = [], path∃(str, r, refs0 .last, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ refs ≠ [] → (r ' + refs) .last = refs .last])]]