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Proof step 28 from proof add-lastrec (conclusion)

⊦ vals ≠ [] → addarray(r, ty, vals, st) = (addarray(r, ty, vals .butlast, st)[r -- n→i((# vals) -1) ', vals .last][r -- _length, intval(n→i(# vals))])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 27:
⊦ vals = [], addarray(r, ty, vals, st) = (addarray(r, ty, vals .butlast, st)[r -- n→i(# vals - 1) ', vals .last][r -- _length, intval(n→i(# vals))])

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ n -1 = n - 1])]]