An invariant for pairs of almost commuting unbounded operators

Details An invariant for pairs of almost commuting unbounded operators An invariant for pairs of almost commuting unbounded operators

1997-02-17

arxiv.org/abs/funct-an/9702013v1

Mathematics

Functional Analysis

9 pages, LaTeX, version 2.09, no figures

Scientific paper

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).

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