Geodesic
An Invariant of a Pair of Almost Commuting Unbounded Operators
Funkcionalʹnyj analiz i ego priloženiâ, Tome 32 (1998) no. 4, pp. 88-91.

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V. M. Manuilov. An Invariant of a Pair of Almost Commuting Unbounded Operators. Funkcionalʹnyj analiz i ego priloženiâ, Tome 32 (1998) no. 4, pp. 88-91. http://geodesic.mathdoc.fr/item/FAA_1998_32_4_a12/

[1] Choi M.-D., “Almost commuting matrices need not be nearly commuting”, Proc. Amer. Math. Soc., 102 (1988), 528–533 | DOI | MR

[2] Exel R., Loring T. A., “Invariants of almost commuting unitaries”, J. Funct. Anal., 95 (1991), 364–376 | DOI | MR | Zbl

[3] Kato T., Teoriya vozmuschenii lineinykh operatorov, Mir, M., 1972 | MR | Zbl

[4] Rid M., Saimon B., Metody sovremennoi matematicheskoi fiziki. T. 1. Funktsionalnyi analiz, Mir, M., 1977 | MR