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Proof step 5 from proof pathex-putbyteval-01 (previous step)

okbytearray(r2, st), validrefs(str, r ' + refs0, mkclasstype(`java.lang.Object' .class), st[r2 -- i ', byteval(by)]) ⊦ refs0 = [], junkref(str, r, st), ∃ refs. refs ≠ [] ∧ refs .first = r ∧ refs .last = refs0 .last ∧ validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st)

User applied rule exists right

And obtained the following new goals

Proof step 4:
⊦ okbytearray(r, st) ∧ ¬ validrefs(str, refs, ty, st) → ¬ validrefs(str, refs, ty, st[r -- i ', byteval(by)])

Rule argument

[EXRARG : pos: right 3, [extquanttermlist: (r ' + refs0) abort:F , discard:F , computed:F ]]

Additional information

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