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Proof step 2 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 3:
⊦ n ' = n + []
Proof step 4:
n < # ar ⊦ ar.mapIndices(n + [], f) = ar[n, f(ar[n])]

Rule argument

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

Additional information

Used terms: n