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数学
A GUESS ABOUT POSITIVE APPROXIMATION
<正> In [1], P. R. Halmos proposed the following guess: for Hilbert operator A=B+ iC, the inequality(*) holds. Here δ(A) denotes the distance from A to the set of positive operators in the Hilbert space H. And he proved
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数学
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Chinese Science Bulletin
1990年21期

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