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The Helmholtz differential equation is not separable in toroidal coordinates

The partial differential equation u_t+2uu_x-nuu_(xx)+muu_(xxx)=0.

In two-dimensional bipolar coordinates, Laplace's equation is ((coshv-cosu)^2)/(a^2)((partialF^2)/(partialu^2)+(partialF^2)/(partialv^2))=0, which simplifies to ...

The second-order ordinary differential equation y^('')+alpha(x)y^'+x^2y^n=0.

As shown by Morse and Feshbach (1953), the Helmholtz differential equation is separable in confocal paraboloidal coordinates.

The so-called generalized Kadomtsev-Petviashvili-Burgers equation is the partial differential equation ...

The third-order ordinary differential equation y^(''')+alphayy^('')+beta(1-y^('2))=0.

In bipolar coordinates, the Helmholtz differential equation is not separable, but Laplace's equation is.

The Helmholtz differential equation is not separable in bispherical coordinates.

Whittaker and Watson (1990, pp. 539-540) write Lamé's differential equation for ellipsoidal harmonics of the first kind of the four types as ...