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Enneper–Weierstrass parameterization : ウィキペディア英語版
Weierstrass–Enneper parameterization
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 2''m'' (or equivalently, such that the product ƒ''g''2 is holomorphic), and let ''c''1, ''c''2, ''c''3 be constants. Then the surface with coordinates (''x''1,''x''2,''x''3) is minimal, where the ''x''''k'' are defined using the real part of a complex integral, as follows:
:\begin
x_k(\zeta) & \varphi_(z) \, dz \right\} + c_k , \qquad k=1,2,3 \\
\varphi_1 & 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.〔Dierkes, U., Hildebrandt, S., Küster, A., Wohlrab, O. ''Minimal surfaces'', vol. I, p. 108. Springer 1992. ISBN 3-540-53169-6〕
For example, Enneper's surface has ƒ(''z'') = 1, ''g''(''z'') = ''z''.
==See also==

* Associate family
* Bryant surface, found by an analogous parameterization in hyperbolic space

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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