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arXiv 1104.2806math.FA
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向量值函数空间上的乘法算子

Multiplication operators on vector-valued function spaces

Hulya Duru, Arkady Kitover, Mehmet Orhon

摘要:

设$E$是概率测度空间$(Ω,Σ,μ).$上的Banach函数空间,$X$是Banach空间,$E(X)$是相应的Köthe-Bochner空间. $E(X)$上的一个算子称为乘法算子,如果它是由$L^{\infty}(μ).$中的一个函数相乘给出的。我们证明了$E(X)$上的算子$T$是乘法算子当且仅当$T$与$L^{\infty}(μ)$可交换,并且由常向量生成的循环子空间保持不变-作为推论,我们证明了这等价于$E(X).$满足Calabuig,Rodríguez,Sánchez-Pérez在[3]中考虑的函数方程。

英文摘要:

Let $E$ be a Banach function space on a probability measure space $(Ω,Σ,μ).$ Let $X$ be a Banach space and $E(X)$ be the associated Köthe-Bochner space. An operator on $E(X)$ is called a multiplication operator if it is given by multiplication by a function in $L^{\infty}(μ).$ In the main result of this paper, we show that an operator $T$ on $E(X)$ is a multiplication operator if and only if $T$ commutes with $L^{\infty}(μ)$ and leaves invariant the cyclic subspaces generated by the constant vector-valued functions in $E(X).$ As a corollary we show that this is equivalent to $T$ satisfying a functional equation considered by Calabuig, Rodríguez, Sánchez-Pérez in [3].

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