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Proof step 7 from proof subset-insert-01 (previous step)

c ∈ s, b ∈ s ++ a ++ a0 ⊦ a0 = a, c = b, a0 ∈ s, a ∈ s, s ⊆ s ++ a ++ a0 ++ b ++ c

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
c ∈ s, b ∈ s ⊦ a0 = a, c = b, a0 ∈ s, a ∈ s, s ⊆ s ++ a ++ a0 ++ b ++ c

Rule argument

Additional information

Used simplifier rules: In-insert: ⊦ a ∈ s ++ b ↔ a = b ∨ a ∈ s;%add-01: ⊦ s ++ a ++ a = s ++ a;%subset-insert: ⊦ s ⊆ s ++ a ++ b ++ c;%addtwo: ⊦ s ++ a ++ b ++ a = s ++ b ++ a;