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Special functions, orthogonal polynomials, harmonic analysis, ordinary differential equations (ODE's), differential relations, calculus of variations, approximations, expansions, asymptotics.

3 votes
1 answer
610 views

Searching for the proof of a certain claim in Arnold's ODE book from 1992

I was reading today the book of Stephen Wiggins called "Global Bifurcations and Chaos" (the 1988 edition). On pages 12-13 he writes the following: Consider the following ordinary differential equatio …
0 votes
1 answer
162 views

Iterating the the ODE for Bessel function

If we look at the Bessel ODE: $$x^2 y'' + xy' + (x^2 - \alpha^2)y = 0$$ Suppose I then put the solution to the above ODE as $J_{\alpha}(x)$ in the RHS, and try to solve the following ODE: $$x^2 y'' + …
3 votes
1 answer
170 views

Translation to English of Brillouin's analysis of Airy's integral

I am trying to read the following paper by Leon Brillouin (the part on page 16 onwards): Léon Brillouin, Sur une méthode de calcul approchée de certaines intégrales dite méthode du col, Annales sc …
2 votes
2 answers
211 views

Caratheodory equations

Ok, I am reading Fillipov book on discontinuous right hand side differential equations (the red book). He states the next lemma: " Let the function $f(t,x)$ satisfy the Caratheodory conditions and le …
-4 votes
1 answer
571 views

Derivatives of infinite order [closed]

Is there any sense of taking an infinite number of derivatives? Is it discussed in the literature? For example, can one make sense of $$\frac{\partial^{\infty}f(x_1,x_2,\cdots)}{\partial x_1 \partia …
3 votes
0 answers
587 views

Differential Equations vs Difference Equations

My question is: Is there a duality between a solution of an ODE,PDE,SDE or integral equations with their analog counterpart in the discrete domain? I mean if I know a solution to the difference equa …
4 votes
1 answer
560 views

Books request on nonlinear recurrence relations.

Hi, do you have some sort of a bibliography on advanced techniques in recurrence equations, such as nonlinear ones and others? As I see it recurrence equations are quite similar to differential equat …