关于A. E. Nussbaum关于希尔伯特空间中闭线性算子族的可测性
On a Question of A. E. Nussbaum on Measurability of Families of Closed Linear Operators in a Hilbert Space
摘要:
这篇文章的目的是回答问题A。E.努斯鲍姆制定于1964年之间的可能等价性弱可测性的一个家庭的密集定义,闭算子T(t),t真正的,在一个可分离的复杂希尔伯特空间H一方面,和概念的可测性的2 \times 2算子值矩阵的投影到图形伽玛(T(t))的T(t)的另一方面,在消极的。我们的结果证明了向量值希尔伯特空间L ^2(\mathbb R; dt; H)中算子族T(t)关于勒贝格测度的直接积分和与T(t)的逐点应用相关的自然最大定义算子之间的有趣区别。我们还提供了明确的标准的可测性矩阵的投影到图伽玛(T(t))的T(t)。
英文摘要:
The purpose of this note is to answer a question A. E. Nussbaum formulated in 1964 about the possible equivalence between weak measurability of a family of densely defined, closed operators T(t), t real, in a separable complex Hilbert space H on one hand, and the notion of measurability of the 2 \times 2 operator-valued matrix of projections onto the graph Gamma(T(t)) of T(t) on the other, in the negative. Our results demonstrate an interesting distinction between the direct integral over the family of operators T(t) with respect to Lebesgue measure and the naturally maximally defined operator associated with pointwise application of T(t) in the vector-valued Hilbert space L^2(\mathbb R; dt; H). We also provide explicit criteria for the measurability of the matrix of projections onto the graph Gamma(T(t)) of T(t).
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