Relative Dimensionality in Operator Rings
Relative Dimensionality in Operator Rings
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算子环中的相对维数
DOI:
10.32917/hmj/1558404098
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发表时间:
1941
期刊:
影响因子:
--
通讯作者:
Fumitomo Maeda
中科院分区:
文献类型:
--
作者:
Fumitomo Maeda
In a Hilbert space, let M be a ring containing 1. We write ilJc 9c ( .... M) if a partially isometric operator U E M exists, the initial and final sets of which are 9JI. and 9c respectively. When M is a factor, F. J. Murray and J. v. Neumann have proved the following comparability theorem: "If 9J/:, 9, 1 M, then either ilJc 9c' c 9c or 9c ~ im' c im."<1> In the present paper I shall investigate the case where M is not a factor, and obtain the same results (cf. Theorems I-IV below) as those in reducible continuous geometry. From this fact we may conjecture that with respect to dimensionality there is a lattice theory which contains both the continuous geometry and the operator rings.