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35Sxx - Pseudodifferential operators and other generalizations of partial differential operators [MSC 2020] |
35Pxx - Spectral theory and eigenvalue problems for partial differential equations [MSC 2020] |
47Gxx - Integral, integro-differential, and pseudodifferential operators [MSC 2020] |
35Jxx - Elliptic equations and elliptic systems [MSC 2020] |
35Lxx - Hyperbolic equations and hyperbolic systems [MSC 2020] |
35Axx - General topics in partial differential equations [MSC 2020] |
35Gxx - General first-order partial differential equations and systems of first-order partial differential equations [MSC 2020] |
35Hxx - Close-to-elliptic equations [MSC 2020] |
35Mxx - Partial differential equations of mixed type and mixed-type systems of partial differential equations [MSC 2020] |