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Proof step 1 from proof int-inserte (conclusion)

⊦ a ∈ s → s ∩ (s0 ++ a) ≠ ∅

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
a ∈ s, a0 ∈ s, ∀ a0. ¬ a0 ∈ s ∨ ¬ a0 ∈ s0 ++ a ⊦

Rule argument

Additional information

Used simplifier rules: int-rax: ⊦ a ∈ s1 ∩ s2 ↔ ¬ ¬(a ∈ s1 ∧ a ∈ s2);%int-a: ⊦ (s ∩ s0) ∩ s1 = s ∩ s0 ∩ s1;%ne-01: ⊦ a ∈ s → s ≠ ∅; (forward) from specification set-basic%In-empty: ⊦ ¬ a ∈ ∅; from specification set-basic%Extension: ⊦ s1 = s2 ↔ (∀ a. a ∈ s1 ↔ a ∈ s2); from specification set-basic