List questions from perturbation-theory

Published on 26 Jan 2019 - 21:21

192

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Perturbation solution Dirac equation

Published on 03 Feb 2019 - 21:48

430

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Perturbation expansion within trig function

Published on 09 Feb 2019 - 19:28

126

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Showing that $\lambda - (A + B)$ has dense range

Published on 23 Mar 2026 - 9:23

69

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Can we perturb a low rank map to a full rank map in a smooth way?

Published on 19 Feb 2019 - 16:05

97

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Stationary Phase with controlled phase $|\int_0^Te^{\frac{i}{\epsilon}\phi_j(t)}dt| = O(\epsilon)$

Published on 24 Mar 2026 - 22:15

204

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Solution Poisson Equation by Homotopy Perturbation Method

Published on 23 Mar 2026 - 0:24

71

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Definition of perturbation using norms

Published on 05 Mar 2019 - 14:52

74

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Expected value of eigenvalues of perturbed matrix

Published on 05 Mar 2019 - 19:40

349

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Perturbation Methods ODE Example

Published on 11 Mar 2019 - 5:05

923

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Matching expansion of an ODE: $\epsilon y'' + xy' + y = 0$

Published on 25 Mar 2026 - 3:25

1.6k

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Find a two term asymptotic expansion of the following problem

Published on 26 Mar 2019 - 10:17

490

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Can we choose smoothly the singular vectors of a matrix?

Published on 26 Mar 2019 - 11:49

145

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Singular perturbation theory in non-standard form

Published on 27 Mar 2019 - 18:14

786

Views

How do the eigenvalues change if we change the diagonal entries of the matrix?

Published on 23 Feb 2026 - 20:42

List Question

Perturbation of Diracs equation (first order)

Perturbation solution Dirac equation

Perturbation expansion within trig function

Showing that $\lambda - (A + B)$ has dense range

Can we perturb a low rank map to a full rank map in a smooth way?

Stationary Phase with controlled phase $|\int_0^Te^{\frac{i}{\epsilon}\phi_j(t)}dt| = O(\epsilon)$

Solution Poisson Equation by Homotopy Perturbation Method

Definition of perturbation using norms

Expected value of eigenvalues of perturbed matrix

Perturbation Methods ODE Example

Matching expansion of an ODE: $\epsilon y'' + xy' + y = 0$

Find a two term asymptotic expansion of the following problem

Can we choose smoothly the singular vectors of a matrix?

Singular perturbation theory in non-standard form

How do the eigenvalues change if we change the diagonal entries of the matrix?

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