Masoumeh Sajjadi - Department of Mathematics, Payame Noor University, IRAN

OD-characterization of projective special linear groups in dimension six was investigated by B. Akbari,et.al.,only on Galois field with three elements, they proved the OD-characterizability of L۶(۳). Now in this paperwe show that the projective special linear groups L۶(۴) and L۶(۵) are OD-characterizable too.