List of equations in gravitation

Richmond surface for m=2.

In differential geometry, a Richmond surface is a minimal surface first described by Herbert William Richmond in 1904. It is a family of surfaces with one planar end and one Enneper surface-like self-intersecting end.

It has Weierstrass–Enneper parameterization $f(z)=1/z^{m},g(z)=z^{m}$. This allows a parametrization based on a complex parameter as

${\begin{aligned}X(z)&=\Re [(-1/2z)-z^{2m+1}/(4m+2)]\\Y(z)&=\Re [(-i/2z)+iz^{2m+1}/(4m+2)]\\Z(z)&=\Re [z^{n}/n]\end{aligned}}$

The associate family of the surface is just the surface rotated around the z-axis.

Taking m = 2 a real parametric expression becomes:

${\begin{aligned}X(u,v)&=(1/3)u^{3}-uv^{2}+{\frac {u}{u^{2}+v^{2}}}\\Y(u,v)&=-u^{2}v+(1/3)v^{3}-{\frac {u}{u^{2}+v^{2}}}\\Z(u,v)&=2u\end{aligned}}$

References

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