choroid
发表于 2025-3-30 10:56:29
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dithiolethione
发表于 2025-3-30 13:01:44
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AVANT
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 .).