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Proof step 27 from proof ac-in-09 (previous step)

is_indexkey(sk), ∀ r, class1, st. r = jvmref ∨ (r ∈ addclass(class1, fis0, st) ↔ r ∈ st) ⊦ r = jvmref, r ∈ addclass(class1, fis0, st) ↔ r ∈ st

User applied rule case distinction

And obtained the following new goals

Proof step 25:
r ∈ addclass(class1, fis0, st), is_indexkey(sk), ∀ r, class1, st. r = jvmref ∨ (r ∈ addclass(class1, fis0, st) ↔ r ∈ st) ⊦ r ∈ st, r = jvmref
Proof step 26:
r ∈ st, is_indexkey(sk), ∀ r, class1, st. r = jvmref ∨ (r ∈ addclass(class1, fis0, st) ↔ r ∈ st) ⊦ r ∈ addclass(class1, fis0, st), r = jvmref

Rule argument

[CASEDARG : pos: right 2, ()]

Additional information

[[CONCRETESIMPRULES : ()]]