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Triangular-\(\theta \) summability of double Fourier series on quantum tori

  • Yong Jiao,
  • Tiantian Zhao,
  • Dejian Zhou

摘要

We study the triangular \(\theta \) θ -mean of the partial sums of \(f \in L_{p}({\mathbb {T}}_{q}^{2})\) f L p ( T q 2 ) and prove the following noncommutative weak and strong type maximal inequalities: \(\begin{aligned} \Vert (\sigma _n^{\Delta ,\theta }(f))_{n\ge 1}\Vert _{\Lambda _{1,\infty }({\mathbb {T}}_q^2,\ell _{\infty })}\le c_\theta \Vert f\Vert _{L_1({\mathbb {T}}_{q}^2)},\quad p=1 \end{aligned}\) ( σ n Δ , θ ( f ) ) n 1 Λ 1 , ( T q 2 , ) c θ f L 1 ( T q 2 ) , p = 1 and \(\begin{aligned} \left\| \left( \sigma _{n}^{\Delta ,\theta }(f)\right) _{n \ge 1}\right\| _{L_p({\mathbb {T}}_q^2, \ell _{\infty })} \le c_{p, \theta }\Vert f\Vert _{L_p({\mathbb {T}}_q^2)},\quad 1<p<\infty , \end{aligned}\) σ n Δ , θ ( f ) n 1 L p ( T q 2 , ) c p , θ f L p ( T q 2 ) , 1 < p < , where \({\mathbb {T}}_{q}^{2}\) T q 2 is a 2-dimensional quantum torus. As a consequence, we obtain the bilateral almost uniform convergence of \(\sigma _n^{\Delta ,\theta }(f)\) σ n Δ , θ ( f ) provided \(f \in L_{p}({\mathbb {T}}_{q}^{2}).\) f L p ( T q 2 ) .