On sums of conjugate EP matrices (Q1194631)

The problem answered here is when a sum of conjugate EP (con-EP) matrices is con-EP. The authors explore necessary and sufficient conditions for the sum of con-EP matrices to be con-EP, and they also prove that sum and parallel sum of parallel summable con-EP matrices are con-EP. The results of this paper for con-EP matrices are analogous to those of EP matrices studied by one of the authors. There are a few minor obvious misprints.