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Proof step 9 from proof diff-consnotin2 (previous step)

∀ a, x0. x1 \ (a ' + x0) = x1 \ x0 ∨ a ∈ x1 ⊦ a0 + (x1 \ (a ' + x0)) = (a0 ' + x1) \ x0, a = a0, a ∈ x1, a0 ∈ a ' + x0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 10:
∀ a, x0. x1 \ (a ' + x0) = x1 \ x0 ∨ a ∈ x1 ⊦ x1 \ (a ' + x0) = x1 \ x0, a = a0, a ∈ x1, a0 ∈ x0

Rule argument

Additional information

Used simplifier rules: diff-n: ⊦ ¬ a ∈ y → (a ' + x) \ y = a + (x \ y);% ⊦ x + y = x + z ↔ y = z; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list% ⊦ a ≠ b → (a ∈ b ' + x ↔ a ∈ x); (s)% ⊦ a + x = a ' + x; (s)