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Two-side estimates for two-weighted discrete Hardy-type operators on a treeare obtained. For general weights we prove the discrete analogue of Evans -Harris - Pick theorem (it is a quite simple consequence from their result). Itgives the order estimate for the norm of the weighted summation operator, butthis estimate is rather complicated. Under some conditions on weights, weobtain estimates which are more simple and convenient for applications.

Estimates for norms of two-weighted summation operators on a tree under some conditions on weights