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Proof step 11 from proof rm-size-02 (previous step)

a0 ∈ x0 ∨ a0 ∈ y, a ∈ y, ∀ a, y. a ∈ y → # rmdup(x0 + a ' + y) = # rmdup(x0 + y) ⊦ # rmdup(x0 + a ' + y) = # (a0 ∈ x0 ∨ a0 ∈ y ⊃ rmdup(x0 + y);a0 ' + rmdup(x0 + y))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
a ∈ y, a0 ∈ x0 ∨ a0 ∈ y, ∀ a, y. a ∈ y → # rmdup(x0 + a ' + y) = # rmdup(x0 + y) ⊦ # rmdup(x0 + a ' + y) = # rmdup(x0 + y)

Proof step 11 from proof rm-size-02 (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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