Abstract
It is shown that the linear transport operator for a slab with periodic boundary conditions, or for infinite medium, can be analyzed within the Friedrichs' model of perturbation for non-selfadjoint operators. This leads to rephrasing Case's generalized eigenfunction expansion in terms of Hilbert space operators only.
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Angelescu, N., Marinescu, N. & Protopopescu, V. On the spectral decompositions of the linear transport operator with periodic boundary conditions. Lett Math Phys 1, 329–333 (1976). https://doi.org/10.1007/BF00398489
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DOI: https://doi.org/10.1007/BF00398489