BASIS PROPERTY OF THE(SIN)SYSTEM WITH A NONLOCAL EVENNESS CONDITION IN THE SPACE SOBOLEV W1

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 space sobolev (W1 p (0; ¼)).