THE SYSTEM OF FUNCTION (SIN), A RIESZ BASIS IN WITH A NONLOCAL EVENNESS CONDITION

In the present paper,we proved that the system of function (sin) a Riesz basis in L2(D+), and basis property of eigenfunction of the Frankl problem with a nonlocal Evenness condition in the subspace sobolev (Wel p(0; ¼))of the space sobolev.