创新 发表于 2025-3-30 10:02:57
http://reply.papertrans.cn/43/4221/422018/422018_51.png慷慨不好 发表于 2025-3-30 12:34:18
I. P. Stolermanussed in Section 7.2. Various tests for determining the convergence or divergence of a double series are given in Section 7.3. In Section 7.4, double power series are treated as a special case of double series, and Taylor double series of infinitely differentiable functions are treated as a special