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Proof step 35 from proof diff-sub-size (previous step)

#(s0 \ s) = # s0 - # s, ∀ a0. a0 ∈ s ++ a → a0 ∈ s0 ⊦ #(s0 \ s) = # s0 - #(s ++ a), a ∈ s0 \ s

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information