choroid 发表于 2025-3-30 10:56:29
http://reply.papertrans.cn/43/4262/426185/426185_51.pngdithiolethione 发表于 2025-3-30 13:01:44
http://reply.papertrans.cn/43/4262/426185/426185_52.pngAVANT 发表于 2025-3-30 19:07:03
Best Approximation by Analytic and Meromorphic Functions,. is called a . to . by analytic functions in .. We have already seen in §1.1 that in general a best approximation is not unique (see Theorem 5.1.5, which gives a necessary and sufficient condition for uniqueness in terms of the Hankel operator .).