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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

"Riemann–Stieltjes derivative"?

It's a long time since this question was active but I'm going to answer the question anyway. This year I have been working in this issue. I defined a Stieltjes derivative from the beginning because I …
Radym's user avatar
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