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Proof step 12 from proof ecs-write (previous step)

⊦ ecs(wlar, # wlar) = (m < # wlar ⊃ (ecs(wlar) -- wlar[m].ec) ++ wle.ec;ecs(wlar)), m < # wlar

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 13:
# wlar ≤ m ⊦ ecs(wlar, # wlar) = ecs(wlar)

Rule argument

Additional information

Used simplifier rules: ⊦ m < n ↔ ¬ n ≤ m; (ss)