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Proof step 3 from proof pathex-levelsubset-equiv (previous step)

path∃(str0, r, r0, st), level⊆(str, str0) ⊦ path∃(str, r, r0, st), junkref(str, r, st), validref(str, r, st[r -- _type] .type, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[x0lemmaarg: spec-name: junkrefs instance-name: lemma-name: validref-runtimetype antecedent: succedent: validref(str, r, st[r -- _type] .type, st) ↔ ¬ junkref(str, r, st) substlist: [st, r, str] → [st, r, str] add preconditions?: F is rewrite lemma?: T current spec?: F rotate lemma?: F replace all?: T paths: ((1, 0, 2)) dummy: () ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r, str)]]