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Proof step 1 from proof append-cancel-l-02 (conclusion)

⊦ σ0 + σ = σ0 ↔ ¬ ¬(σ = [] ∨ ¬ finp(σ0))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ σ0 + σ = σ0 ↔ σ = [] ∨ ¬ finp(σ0)

Rule argument

Additional information