Martins-Ferreira, NelsonMontoli, A.Ursini, A.Linden, T. Van der2025-09-102025-09-102017-03Martins-Ferreira, Nelson & Montoli, A. & Ursini, Aldo & Van der Linden, Tim. (2016). What is an ideal a zero-class of?. Journal of Algebra and Its Applications. 16. 10.1142/S02194988175004990219-49881793-6829http://hdl.handle.net/10400.8/14031We characterise, in pointed regular categories, the ideals as the zero-classes of surjective relations. Moreover, we study a variation of the Smith is Huq condition: two surjective left split relations commute as soon as their zero-classes commute.engjournal article10.1142/s0219498817500499