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Proof step 7 from proof unique-elems-subset (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
bag0 ⊆ bag1, ∀ n. count(n, bag1) ≤ 1 ⊦ count(n, bag0) = 0, count(n, bag0) = 1

Rule argument

Additional information

Used simplifier rules: ⊦ 1 < m ↔ ¬(m = 0 ∨ m = 1); (s)% ⊦ m ≤ n ↔ ¬ n < m; (ss)