We consider and a corresponding geometric mean operator.E.T.
Sawyer showed that the Hardy-type inequality could be characterized by three independent conditions on bearing the weights.We give a simple proof of the fact that if the weight is of product type, then in fact only one condition is needed.Moreover, by using HAIRSPRAY FAST DRY SWEET PEA this information and by performing a limiting procedure we can derive a weight characterization of the corresponding two-dimensional Pólya-Knopp inequality with the geometric mean operator involved.