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Proof step 2 from proof valid-indices-simp (previous step)

nx < # ar ⊦ valid-indices(ar, nx)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ valid-indices(ar, nx) ↔ nx < # ar

Rule argument

Additional information

Used simplifier rules: valid-indices: ⊦ valid-indices(ar, nx) ↔ nx < # ar;