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Proof step 2 from proof to-plus-from-fin (previous step)

n ≤ # x ⊦ (x to n) + (x from n) = x

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
n ≤ # x ⊦ (x to n) + (x from n) = x

Rule argument

Additional information