EP operator EP element involution strong involution semigroup with involution ring with involution regular ring antiregular ring *-regular ring faithful ring C*-algebra group inverse Drazin inverse generalized inverse Moore-Penrose inverse regular element antiregular element polar element quasipolar element global star cancelation law annihilator
Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences
Serdica Mathematical Journal, Vol. 41, No 1, (2015), 83p-116p
This work includes a survey of most of the results concerning EP elements in semigroups and rings with involution and in C*-algebras. 2010 Mathematics Subject Classification: Primary 46L05, 46J05, 46H05, 46H30, 47A05, 47A53, 47A60, 15A09, 15A33, 16A28, 16A32, 16B99,16W10; Secondary 46E25,46K05, 47A12, 47A68.