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Proof step 11 from proof unique-elems-subset (previous step)

count(n, bag1) ≤ 1, ∀ n. count(n, bag0) ≤ count(n, bag1) ⊦ count(n, bag0) = 0, count(n, bag0) = 1

User applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: n abort: F discard: T computed: F

Additional information

Used simplifier rules: let: ⊦ n ≤ n0 ∧ n0 ≤ n1 → n ≤ n1; (forward) from specification nat% ⊦ m ≠ 0 → (m ≤ 1 ↔ m = 1); (s) Used terms: n