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

validrefs(str, r ' + refs0, st[r -- _type] .type, st), junkrefs(str, refs0 .last ' + refs1, st[refs0 .last -- _type] .type, st) ⊦ refs0 = [], ∃ refs. refs ≠ [] ∧ refs .first = r ∧ junkrefs(str, refs, st[refs .first -- _type] .type, st)

User applied rule exists right

And obtained the following new goals

Proof step 6:
validrefs(str, r ' + refs0, st[r -- _type] .type, st), junkrefs(str, refs0 .last ' + refs1, st[refs0 .last -- _type] .type, st) ⊦ refs0 = [], r ' + refs0 + refs1 ≠ [] ∧ (r ' + refs0 + refs1) .first = r ∧ junkrefs(str, r ' + refs0 + refs1, st[(r ' + refs0 + refs1) .first -- _type] .type, st)

Rule argument

[EXRARG : pos: right 2, [extquanttermlist: (r ' + refs0 + refs1) abort:F , discard:T , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r ' + refs0 + refs1)]]