Benítez López, JulioCvetkovic-Ilic, Dragana2015-06-242015-06-242013-10-010096-30031873-5649https://riunet.upv.es/handle/10251/52201We study various functions, principal ideals and annihilators depending on the projections aa(dagger) and a(dagger)a for a Moore-Penrose invertible ring element, extending recent work of O.M. Baksalary and G. Trenkler for matrices. 2013 Elsevier Inc. All rights reserved.Reserva de todos los derechosRing with involutionProjectionsMoore Penrose inversesPrincipal idealsAnnihilatorsMATEMATICA APLICADAArtículo10.1016/j.amc.2013.07.015Abierto