Integrability theorems for power series expansions of two variables
Yoshimitsu Hasegawa · Pacific Journal of Mathematics · 1973
Let f(x 9 y) = Σ;,« =0 ^,Λ B in the triangle x + y ^ 1, x, V^O, or in the quarter-disk x 2 + y 2 < 1, x 9 y ^ 0. This paper show some relations between L-integrability of f(x,y) 9 with certain multipliers, and the coefficients a m , n .