%0 Journal Article %A Lerner, Andrei %A Ombrosi, Sheldy Javier %T A boundedness criterion for general maximal operators %D 2010 %@ 0214-1493 %U https://hdl.handle.net/20.500.14352/97596 %X We consider maximal operators MB with respect to a basis B. In the case when MB satisfies a reversed weak type inequality, we obtain a boundedness criterion for MB on an arbitrary quasiBanach function space X. Being applied to specific B and X this criterion yields new and short proofs of a number of well-known results. Our principal application is related to an open problem on the boundedness of the two-dimensional one-sided maximal function M+ on Lpw. %~