# σσ[n] = ∞, # σσ = ∞, σσ[n] + σ = σσ[n0], mon(σσ), n < n0 ⊦ σσ = [], n0 = 0, σσ[n0] = σσ[n]
Used simplifier rules: prefix-def: ⊦ σ ⊑ σ0 ↔ (∃ σ1. σ + σ1 = σ0);