空间L22(R2+;e-x-yxαyβ)中的函数用傅立叶——拉盖尔级数部分和逼近的某些问题
공간L22(R2+;e-x-yxαyβ)중적함수용부립협——랍개이급수부분화핍근적모사문제
Certain problems of the approximation of functions by Fourier-Laguerre sums in the space L22 (R2+ ; e-x-y xα yβ)