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Proof step 21 from proof ac-in-02 (previous step)

¬ is_indexkey(fv .1), r -- i ' ∈ addclass(class1, fv ' + fis0, st), r ∈ addclass(class1, fv ' + fis0, st), ∀ r0, i0, class, st0. r0 -- i0 ' ∈ addclass(class, fis0, st0) → r0 -- i0 ' ∈ st0 ⊦ r -- i ' ∈ st

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 20:
r -- i ' ∈ addclass(class1, fv ' + fis0, st), r ∈ addclass(class1, fv ' + fis0, st), is_fskey(fv .1), ∀ r0, i0, class, st0. r0 -- i0 ' ∈ addclass(class, fis0, st0) → r0 -- i0 ' ∈ st0 ⊦ r -- i ' ∈ st

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_indexkey(sk) ↔ is_fskey(sk)])]]