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

5 votes
1 answer
771 views

Analytical solution for coupled ODE system

I came across this coupled system of ODE in my research (related to foulant in reaction diffusion system): $$\frac{d^2y}{dx^2} - A\frac{yz}{x} = 0$$ $$\frac{d^2z}{dx^2} - B\frac{yz}{x} = 0$$ where $A$ …
4 votes
4 answers
540 views

Non-constant-coefficient second-order linear ODE

I came across this equation in my research (related to reaction diffusion system): $$\frac{d^2y}{dr^2}+B\operatorname{sech}^2(r) \frac{dy}{dr} + Cy = 0$$ where $B$ and $C$ are constants. Can it be sol …