The best order of approximation by (N, P) means of T-F series is discussed, and asufficient condition to reach this order is found.
讨论了算子（N，P）的最佳逼近阶以及达到此逼近阶的一个充分条件。
The best order of approximation by (N, P) means of T-F series is discussed, and asufficient condition to reach this order is found.
讨论了算子（N，P）的最佳逼近阶以及达到此逼近阶的一个充分条件。
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