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Partially supported by RFBR grant No. 96-01-00276 and INTAS grant No 96-1099.
Moscow State University, Department of Mathematics and Mechanics, manuilov@mech.math.msu.su. Translated from Funktsional’nyi Analiz i Ego Prilozheniya, Vol. 32, No. 4, pp. 88–91, October–December, 1998.
Translated by V. M. Manuilov
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Manuilov, V.M. An invariant of a pair of almost commuting unbounded operators. Funct Anal Its Appl 32, 288–291 (1998). https://doi.org/10.1007/BF02463216
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DOI: https://doi.org/10.1007/BF02463216