Geodesic
Trace Formula for Nuclear Perturbations of Discrete Nonselfadjoint Operators
Publications de l'Institut Mathématique, _N_S_50 (1991) no. 64, p. 135 .

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It is shown that, if $T$ is a discrete nonselfadjoint operator, and $P$ is nuclear, than, under some condition, $T+P$ is discrete. A regularized trace formula is given. It is shown that this result is applicable to differential operators given by regular boundary conditions.
Classification : 47B10 47A55 
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     author = {Darko Milinkovi\'c},
     title = {Trace {Formula} for {Nuclear} {Perturbations} of {Discrete} {Nonselfadjoint} {Operators}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {135 },
     publisher = {mathdoc},
     volume = {_N_S_50},
     number = {64},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a16/}
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Darko Milinković. Trace Formula for Nuclear Perturbations of Discrete Nonselfadjoint Operators. Publications de l'Institut Mathématique, _N_S_50 (1991) no. 64, p. 135 . http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a16/