Maryam Mast Zohouri - Department of Mathematics, Payame Noor University P.O. Box ۱۹۳۹۵-۳۶۹۷, Tehran, Iran
S. Khaleghi Zadeh - Department of Mathematics, Payame Noor University P.O. Box ۱۹۳۹۵-۳۶۹۷, Tehran, Iran

In this note, we investigate some properties of doubly center matrices. One interesting problem which wediscuss is whether the k-subdirect sum of doubly center matrices forms a doubly center matrix? and, whethera doubly center matrix can be written of the form of k-subdirect sum of two doubly center matrices.