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Proof step 7 from proof del-notin (previous step)

count(a, bag0) = 0, ∀ a. count(a, bag0) = 0 → bag0 -- a = bag0 ⊦ (bag0 -- a) ++ a0 = bag0 ++ a0, a0 = a

User applied rule all left

And closed the goal!

Rule argument

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

Additional information

Used terms: a