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Weighted integrability of double cosine series with nonnegative coefficients

Chang-Pao Chen, Ming-Chuan Chen (2003)

Studia Mathematica

Let f c ( x , y ) j = 1 k = 1 a j k ( 1 - c o s j x ) ( 1 - c o s k y ) with a j k 0 for all j,k ≥ 1. We estimate the integral 0 π 0 π x α - 1 y β - 1 ϕ ( f c ( x , y ) ) d x d y in terms of the coefficients a j k , where α, β ∈ ℝ and ϕ: [0,∞] → [0,∞]. Our results can be regarded as the trigonometric analogues of those of Mazhar and Móricz [MM]. They generalize and extend Boas [B, Theorem 6.7].

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