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Proof step 6 from proof insert-nonempty (previous step)

∀ a0. (a0 = a ⊃ 1;0) + count(a0, bag) = 0 ⊦

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: a

Additional information

Used simplifier rules: ⊦ m + 1 ≠ 0; (s)%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic Used terms: a