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Proof step 29 from proof validref-subspec-samesubclasses-01 (previous step)

tdname+∃(str0, ty .jtelemtype .class), same-subclasses-contains(ty .jtelemtype .class, str, str0), validref(str0, r, ty, st) ⊦ validref(str, r, ty, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)
Proof step 28:
tdname+∃(str0, ty .jtelemtype .class), same-subclasses-contains(ty .jtelemtype .class, str, str0), validref(str0, r, ty, st) ⊦ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st)

Rule argument

[speclemmaarg: , validref(str, r, ty, st) ↔ r = jvmref ∨ st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st) ,[st, ty, r, str] → [st, ty, r, str] ,F ,junkrefs , ,validref-def ]

Additional information

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