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Proof step 1 from proof valid-wl-map-indices (conclusion)

⊦ valid-wl(apebs, wlar) ∧ valid-indices(wlar, nx) ∧ ¬ dups(nx) ∧ indices-erasing(wlar, nx) → valid-wl(apebs, wlar.mapIndices(nx, λ wle. wle.ec:= n))

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information