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Proof step 1 from proof length-from (conclusion)

¬ # x < n ⊦ #(x from n) = # x - n

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n ≤ # x ⊦ #(x from n) = # x - n

Rule argument

Additional information

Used simplifier rules: lels: ⊦ ¬ m < n ↔ n ≤ m; from specification nat