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Brief communications

Rate of approximation of functions by negative-order Césaro means of double orthogonal series

L. G. Kovalenko

South Ukrainian State K. D. Ushynsky Pedagogical University

UDC: 517.512

Received: 05.06.2002

 English version: Russian Mathematics (Izvestiya VUZ. Matematika), 2004, 48:2, 69–72

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