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Proof step 4 from proof map-indices-one (previous step)

n < # ar ⊦ ar.mapIndices(n + [], f) = ar[n, f(ar[n])]

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ n + nx = n ' + nx
Proof step 6:
n < # ar ⊦ ar.mapIndices(n ' + [], f) = ar[n, f(ar[n])]

Rule argument

spec: list, inst: nat-list-set name: c seq: ⊦ n + nx = n ' + nx subst: [nx, n] → [[], n] flags: <all paths>

Additional information

Used terms: [], n