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Proof step 22 from proof cyclic-def-simple (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 21:
validrefs(str, r ' + refs1, mkclasstype(`java.lang.Object' .class), st) ⊦ r = jvmref, is_obj(str, r, st), ¬ r ∈ refs1 ∧ ¬ dups(refs1), ∃ refs0. dups(refs0) ∧ refs0 .first = r ∧ validrefs(str, refs0, st[refs0 .first -- _type] .type, st)

Rule argument

[emptyarg]

Additional information

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