A remark on the minimal index of subfactors
A remark on the minimal index of subfactors
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关于子因子最小指数的说明
DOI:
10.1016/0022-1236(92)90118-3
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发表时间:
1992
影响因子:
1.7
通讯作者:
R. Longo
中科院分区:
文献类型:
--
作者:
H. Kosaki;R. Longo
Abstract Let M⫆ N be a factor-subfactor pair with a faithful normal conditional expectation E: M→ N satisfying Ind E<+∞. Let N⫅ M⫅ M 1⫅ M 2··· be the Jones tower of basic extensions, and E k: M k→ M k− 1 be the dual expectation constructed canonically from the given E. We prove that, if E: M→ N is minimal, then so is the composition E° E 1°···° E k: M k→ N. Some consequences of this result are also presented.