University of Mohaghegh Ardabili Journal of Hyperstructures 2251-8436 6 1 2017 06 01 Product of derivations on triangular banach algebras 28 39 2659 10.22098/jhs.2017.2659 EN Mohammad Hossein Sattari Department of Mathematics, Azarbaijan Shahid Madani University, P.O.Box 53751 71379, Tabriz, Iran Hamid Shafieasl Department of Mathematics, Azarbaijan Shahid Madani University, P.O.Box 53751 71379, Tabriz, Iran Journal Article 2016 04 24 In this paper, we give a necessary and sufficient condition for the product of two derivations on the triangular Banach algebra to be a derivation. We also study the case where the product of derivations is commutative. https://jhs.uma.ac.ir/article_2659_84a1c7abcaa45d1882d37e87f5669b82.pdf