An invariant for pairs of almost commuting unbounded operators

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For a wide class of pairs of unbounded selfadjoint operators with bounded commutator we construct a K-theoretical integer invariant which is continuous, is equal to zero for commuting operators and is equal to one for the pair (x, i d/dx).
9 pages, LaTeX, version 2.09, no figures

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Functional Analysis

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http://salesiana.dossiersoluciones.com/handle/123456789/152431

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/funct-an/9702013
 http://arxiv.org/abs/funct-an/9702013

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arXiv