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Proof step 4 from proof emptystream-cancel (previous step)

# σ = ⌜n⌝ ⊦ # σ = ∞, σ + σ⊥ = σ⊥ ↔ σ = σ⊥ to n

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
# σ = ⌜n⌝ ⊦ σ + σ⊥ = σ⊥ ↔ σ = σ⊥ to n

Rule argument

Additional information

Used simplifier rules: ⊦ ⌜m⌝ ≠ ∞; (s)