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Proof step 8 from proof rm-allsize (previous step)

a ∈ x0, (∀ a. a ∈ x0 ↔ a ∈ y) → # rmdup(x0) = # rmdup(y), ∀ y. (∀ a. a ∈ x0 ↔ a ∈ y) → # rmdup(x0) = # rmdup(y), ∀ a0. a0 ∈ x0 ↔ a0 ∈ y ⊦ # rmdup(x0) = # rmdup(y)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 9:
a ∈ x0, ∀ y. (∀ a. a ∈ x0 ↔ a ∈ y) → # rmdup(x0) = # rmdup(y), ∀ a0. a0 ∈ x0 ↔ a0 ∈ y ⊦ # rmdup(x0) = # rmdup(y), a0 ∈ x0 ↔ a0 ∈ y

Proof step 8 from proof rm-allsize (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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