On the non-homogeneous central Morrey type spaces in $L^{1}(mathbf{R}^{n})$ and the weak boundedness of some operators (The deepening of function spaces and its environment)

Abstract

Our aim in this note is to discuss thc weak boundcdncss of thc maximal and generalized Ricsz potential opcrators in thc non-homogeneous central Morrcy type spacc mathbb{J}I^{1q, nu}(R^{gammaiota}) of all measurable functions f on R^{rt} satisfying Vert fVert{lambda f^{1qv}(R^{n})}=(int{1}^{infty}(r^{-nu}Vert fVert {L^{1}(B(0, tau))})^{q}frac{dr}{r})^{1/q}<infty for -infty<v<infty and 0<qleqinfty ; when q=infty, we apply a necessary modification. To do this, wc consider thc family WM^{p, q, nu}(R") of all functions fin L_{foc}^{p}(R^{71}) such that Vert fVert_{Wf_{1}J^{p.q.nu}(R^{??})}=sup_{lambdacdot 0}int_{1} ^{infty}(r^{-nu}lambda|{xin B(0, r):|f(x)|>lambda}|^{{imath}/p})^{q} frac{dr}{r}<infty, where 1leq pleqinfty.