|
47-XX - Operator theory [MSC 2020] |
47A10 - Spectrum, resolvent [MSC 2020] |
42C15 - General harmonic expansions, frames [MSC 2020] |
47Fxx - Partial differential operators [MSC 2020] |
47Bxx - Special classes of linear operators [MSC 2020] |
58J40 - Pseudodifferential and Fourier integral operators on manifolds [MSC 2020] |
42A16 - Fourier coefficients, Fourier series of functions with special properties, special Fourier series [MSC 2020] |
93C55 - Discrete-time control/observation systems [MSC 2020] |
47G30 - Pseudodifferential operators [MSC 2020] |
47L15 - Operator algebras with symbol structure [MSC 2020] |
15Bxx - Special matrices [MSC 2020] |
81U20 - $S$-matrix theory, etc. in quantum theory [MSC 2020] |