## A Cohen type inequality for polynomial expansions associated with the measure $(1-x)^\alpha (1+x)^\beta dx+M\delta_{-1}+N\delta_1$}

J. Math. Sci. Univ. Tokyo
Vol. 15 (2008), No. 2, Page 243--255.

Fejzullahu, Bujar Xh.
A Cohen type inequality for polynomial expansions associated with the measure $(1-x)^\alpha (1+x)^\beta dx+M\delta_{-1}+N\delta_1$}
The purpose of this paper is to establish a Cohen type inequality for Fourier expansion with respect to polynomials associated with the measure $(1-x)^\alpha (1+x)^\beta dx+M\delta_{-1}+N\delta_1,$ where $\delta_t$ is the delta function at a point $t$ and $M,N\geq 0.$