Weierstrass-Enneper parameterization

From Wikipedia, the free encyclopedia

In mathematics, the Weierstrass-Enneper parameterization of minimal surfaces is a classical piece of differential geometry.

Alfred Enneper and Karl Weierstrass studied minimal surfaces as far back as 1863.

Let ƒ and g be functions on either the entire complex plane or the unit disk, where g is meromorphic and ƒ is analytic, such that wherever g has a pole of order m, f has a zero of order 2m (or equivalently, such that the product ƒg2 is holomorphic), and let c1, c2, c3 be constants. Then the surface with coordinates (x1,x2,x3) is minimal, where the xk are defined using the real part of a complex integral, as follows:

\begin{align} x_k(\zeta) &{}= \Re \left\{ \int_{0}^{\zeta} \varphi_{k}(z) \, dz \right\} + c_k , \qquad k=1,2,3 \\ \varphi_1 &{}= f(1-g^2)/2 \\ \varphi_2 &{}= \bold{i} f(1+g^2)/2 \\ \varphi_3 &{}= fg \end{align}

The converse is also true: every nonplanar minimal surface defined over a simply connected domain can be given a parametrization of this type.[1]

For example, Enneper's surface has ƒ(z) = 1, g(z) = z.

[edit] References

  1. ^ Dierkes, U., Hildebrandt, S., Küster, A., Wohlrab, O. Minimal surfaces, vol. I, p. 108. Springer 1992. ISBN 3540531696
 This geometry-related article is a stub. You can help Wikipedia by expanding it.