设A,B和C是Hilbert空间H上的紧算子,定义B(H)上的初等算子:∑(x)=AX+XB+CXD.本文我们给出∑值域闭的一些充分或必要条件.......

This article presents a study of the cloud forest dominated by the Prestoea montana (R. Graham) Nichols. This is a hyper......

In this paper, we establish a new type of alternation theory for more general restricted ranges Chebyshev approximation ......

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