On finite presentability of Bruck-Reilly extensions of a monoid with respect to an endomorphism and its powers.

Let M be a monoid and let θ be an endomorphism of M. We prove that if the Bruck–Reilly extension BR(M, θ) is finitely presented, then the Bruck–Reilly extension BR(M, θm) is also finitely presented for all m ⩾ 1