FATIMA A. GULIYEVA - nstitute of Mathematics and Mechanics of NAS of Azerbaijan, Az۱۱۴۱,Baku, Azerbaijan.
RUBABA H. ABDULLAYEVA - Math teacher at the school No ۲۹۷, Baku, Azerbaijan.

Double system of exponents with complex-valued coefficients is considered. Under some conditions on the coefficients,we prove that if this system forms a basis for the Morrey-Lebesguetype space on [−π; π], then it is isomorphic to the classical systemof exponents in this space

Morrey-Lebesgue type space, System of exponents, Isomorphism, Basicity