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arXiv 2104.12153math.FA
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正线性算子的Riesz表示定理

Riesz representation theorems for positive linear operators

Marcel de Jeu, Xingni Jiang

AI总结:

本文将经典Riesz表示定理从正线性泛函推广到取值于偏序向量空间的正线性算子,构造了取值于扩展正锥的Borel表示测度并给出显式公式,且不要求目标空间为向量格或赋范空间。

摘要:

我们将局部紧Hausdorff空间$X$上$\mathrm{C}_{\mathrm c}(X)$与$\mathrm{C}_{\mathrm 0}(X)$上正线性泛函的Riesz表示定理推广到从这些空间映入偏序向量空间$E$的正线性算子。表示测度定义在$X$的Borel $σ$-代数上,取值于$E$的扩展正锥;相应的积分是序积分。我们给出了表示测度在$X$的开子集和紧子集上取值的显式公式。结果涵盖了空间$E$不必是向量格、也不必是赋范空间的情形。表示测度对映入具有序连续范数的Banach格的正线性算子、映入KB-space上正则算子的正线性算子、映入复Hilbert空间上有界线性算子的弱闭复线性子空间中自伴线性算子的正线性算子,以及映入JBW-代数的正线性算子均存在。

英文摘要:

We generalise the Riesz representation theorems for positive linear functionals on $\mathrm{C}_{\mathrm c}(X)$ and $\mathrm{C}_{\mathrm 0}(X)$, where $X$ is a locally compact Hausdorff space, to positive linear operators from these spaces into a partially ordered vector space $E$. The representing measures are defined on the Borel $σ$-algebra of $X$ and take their values in the extended positive cone of $E$; the corresponding integrals are order integrals. We give explicit formulas for the values of the representing measures at open and at compact subsets of $X$. Results are included where the space $E$ need not be a vector lattice, nor a normed space. Representing measures exist for positive linear operators into Banach lattices with order continuous norms, into the regular operators on a KB-space, into the self-adjoint linear operators in a weakly closed complex linear subspace of the bounded linear operators on a complex Hilbert space, and into JBW-algebras.

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