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Proof step 30 from proof cyclic-def-object (previous step)

is_obj(str, r, st), validrefs(str, r ' + refs1, st[r -- _type] .type, st) ⊦ ∃ refs0. dups(refs0) ∧ refs0 .first = r ∧ validrefs(str, refs0, mkclasstype(`java.lang.Object' .class), st), ¬ r ∈ refs1 ∧ ¬ dups(refs1)

User applied rule exists right

And obtained the following new goals

Proof step 29:
is_obj(str, r, st), validrefs(str, r ' + refs1, st[r -- _type] .type, st) ⊦ dups(r ' + refs1) ∧ (r ' + refs1) .first = r ∧ validrefs(str, r ' + refs1, mkclasstype(`java.lang.Object' .class), st), ¬ r ∈ refs1 ∧ ¬ dups(refs1)

Rule argument

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

Additional information

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