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Proof step 9 from proof pathex-putbyte (previous step)

okbytearray(r1, st), validrefs(str, r ' + refs1, st[r -- _type] .type, st) ⊦ ∃ refs. refs ≠ [] ∧ refs .first = r ∧ refs .last = (refs .first ' + refs1) .last ∧ validrefs(str, refs, st[refs .first -- _type] .type, st[r1 -- i ', byteval(by)])

User applied rule exists right

And obtained the following new goals

Proof step 8:
⊦ okbytearray(r, st) ∧ ¬ validrefs(str, refs, ty, st[r -- i ', byteval(by)]) → ¬ validrefs(str, refs, ty, st)

Rule argument

[EXRARG : pos: right 1, [extquanttermlist: (r ' + refs1) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPNAMEDSEQ : list, references, app-02-ant, ⊦ ¬ refs + refs0 ≠ [] ↔ refs = [] ∧ refs0 = []], [CSIMPNAMEDSEQ : list, references, e, ⊦ r ' ≠ []], [CSIMPNAMEDSEQ : list, references, a, ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPNAMEDSEQ : list, references, c-08, ⊦ (r ' + refs) .first = r])], [EXTRATERMS : (r ' + refs1)]]