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34C10 - Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equation [MSC 2020] |
34Lxx - Ordinary differential operators [MSC 2020] |
39A10 - Additive difference equations [MSC 2020] |
39A12 - Discrete version of topics in analysis [MSC 2020] |
45-XX - Integral equations [MSC 2020] |
45Cxx - Eigenvalue problems for integral equations [MSC 2020] |
45Dxx - Volterra integral equations [MSC 2020] |
45Jxx - Integro-ordinary differential equations [MSC 2020] |
47A10 - Spectrum, resolvent [MSC 2020] |
47B50 - Linear operators on spaces with an indefinite metric [MSC 2020] |
47Gxx - Integral, integro-differential, and pseudodifferential operators [MSC 2020] |