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Proof step 1 from proof leq-append-left (conclusion)
⊦ σ0 + σ1 ≤ σ → (¬ σ0 ≤ σ ↔ false)
Heuristic simplifier applied rule simplifier
And obtained the following new goals
Proof step 2
:
σ0 + σ1 ≤ σ ⊦ σ0 ≤ σ
Rule argument
Additional information