Geodesic
General regularized trace formulae for loaded equations
Ufa mathematical journal, Tome 7 (2015) no. 1, pp. 70-82

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We consider regularized traces for differential operators with the coefficients at the powers of a spectral parameter being the values of an unknown function at prescribed points in its domain. Such differential operators are interpreted as polynomial operator pencils whose coefficients are unbounded fininte-dimensional operators. Basing on the theory of M. V. Keldysh, we construct general regularized trace formulae for such operator pencils. The obtained formulae develop a known result by V. A. Sadovnichii and V. A. Lyubishkin for relative finite-dimensional perturbations of self-adjoint operators.
Keywords: spectrum, operator pencil, regularized traces. 
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     title = {General regularized trace formulae for loaded equations},
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I. D. Tsopanov. General regularized trace formulae for loaded equations. Ufa mathematical journal, Tome 7 (2015) no. 1, pp. 70-82. http://geodesic.mathdoc.fr/item/UFA_2015_7_1_a6/