Journal of the Mathematical Society of Japan

On commuting canonical endomorphisms of subfactors

Takashi SANO

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In the Jones Index theory, Longo's sector theory has been a powerful approach to the analysis for inclusions of factors and canonical endomorphisms have played an important role. In this paper, two topics on commuting canonical endomorphisms are studied: For a composition of two irreducible inclusions of depth 2 factors, the commutativity of corresponding canonical endomorphisms is shown to be the condition for the ambient irreducible inclusion to be of depth 2, that is, to give a finite dimensional Kac algebra. And an equivalent relation between the commuting co-commuting square condition and the existence of two simultaneous commuting canonical endomorphisms is discussed.

Article information

J. Math. Soc. Japan, Volume 55, Number 1 (2003), 131-142.

First available in Project Euclid: 5 December 2007

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Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 46L37: Subfactors and their classification

canonical endomorphism commuting square Kac Algebra depth 2 inclusion


SANO, Takashi. On commuting canonical endomorphisms of subfactors. J. Math. Soc. Japan 55 (2003), no. 1, 131--142. doi:10.2969/jmsj/1196890846.

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