On properties of continuous mapings of nonlimited metric spaces von Davydov , N. A., Давыдов , Н. А.

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Two theorems in the theory of summation of numerical series by lower triangular positive monotone matrices von Davydov, N. A., Давыдов, Н. А., Давыдов, Н. А.

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On necessary and sufficient conditions for the summability of a numerical series to imply its convergence von Davydov, N. A., Давыдов, Н. А., Давыдов, Н. А.

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