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Proof step 11 from proof at-1dim-other (previous step)

¬ (is_fskey(sk) ∧ sk ≠ _type ∧ sk ≠ _length), is_indexkey(sk) ∧ (sk .index < 0 ∨ j ≤ sk .index) ∨ is_fskey(sk) ∧ sk ≠ _length ∧ sk ≠ _type ⊦ (addarray(r0, ty, j, st)[r0 -- sk]) = st[r0 -- sk]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 10:
is_indexkey(sk) ∧ (sk .index < 0 ∨ j ≤ sk .index) ∨ is_fskey(sk) ∧ sk ≠ _length ∧ sk ≠ _type ⊦ (addarray(r0, ty, j, st)[r0 -- sk]) = st[r0 -- sk], ¬ is_indexkey(sk) ∧ sk ≠ _type ∧ sk ≠ _length

Rule argument

[emptyarg]

Additional information

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