ﻻ يوجد ملخص باللغة العربية
We prove that the degenerate trilinear operator $C_3^{-1,1,1}$ given by the formula begin{eqnarray*} C_3^{-1,1,1}(f_1, f_2, f_3)(x)=int_{x_1 < x_2 < x_3} hat{f_1}(x_1) hat{f_2}(x_2) hat{f_3}(x_3) e^{2pi i x (-x_1 + x_2 + x_3)} dx_1dx_2 dx_3 end{eqnarray*} satisfies the new estimates begin{eqnarray*} ||C_3^{-1,1,1}(f_1, f_2, f_3)||_{frac{1}{frac{1}{p_1}+frac{1}{p_2}+frac{1}{p_3}}} lesssim_{p_1, p_2, p_3} ||hat{f}_1||_{p^prime_1} ||f_2||_{p_2}||f_3||_{p_3} end{eqnarray*} for all $f_1 in L^{p_1}(mathbb{R}): hat{f}_1 in L^{p_1^prime}(mathbb{R}) , f_2 in L^{p_2}(mathbb{R})$, and $f_3 in L^{p_3}(mathbb{R})$ such that $2 <p_1 leq infty, 1 < p_2, p_3 < infty, frac{1}{p_1}+frac{1}{p_2} <1$, and $frac{1}{p_2}+frac{1}{p_3} <3/2$. Mixed estimates for some generalizations of $C_3^{-1,1,1}$ are also shown.
Let $L$ be a one-to-one operator of type $omega$ in $L^2(mathbb{R}^n)$, with $omegain[0,,pi/2)$, which has a bounded holomorphic functional calculus and satisfies the Davies-Gaffney estimates. Let $p(cdot): mathbb{R}^nto(0,,1]$ be a variable exponent
In this note we prove the estimate $M^{sharp}_{0,s}(Tf)(x) le c,M_gamma f(x)$ for general fractional type operators $T$, where $M^{sharp}_{0,s}$ is the local sharp maximal function and $M_gamma$ the fractional maximal function, as well as a local ver
Let $S_{alpha}$ be the multilinear square function defined on the cone with aperture $alpha geq 1$. In this paper, we investigate several kinds of weighted norm inequalities for $S_{alpha}$. We first obtain a sharp weighted estimate in terms of apert
We study the bilinear Hilbert transform and bilinear maximal functions associated to polynomial curves and obtain uniform $L^r$ estimates for $r>frac{d-1}{d}$ and this index is sharp up to the end point.
Let $p(cdot): mathbb R^nto(0,1]$ be a variable exponent function satisfying the globally $log$-Holder continuous condition and $L$ a non-negative self-adjoint operator on $L^2(mathbb R^n)$ whose heat kernels satisfying the Gaussian upper bound estima