“…(A. 21) In the context of the BTZ black hole, we see that the identification (t E , φ) ∼ (t E , φ+2π) can be understood as the transformation generated by the elements of Γ BTZ with a = πr + and b = π|r − |. Meanwhile, the identification (τ, φ) ∼ (τ + β 0 , φ + Φ), an identity transformation, has a = 0, and b = 2π, in which case the associated γ is not loxodromic.…”