In differential geometry and algebraic geometry, the Enneper surface is a self-intersecting surface that can be described parametrically by:

$${\displaystyle {\begin{aligned}x&={\tfrac {1}{3}}u\left(1-{\tfrac {1}{3}}u^{2}+v^{2}\right),\\y&={\tfrac {1}{3}}v\left(1-{\tfrac {1}{3}}v^{2}+u^{2}\right),\\z&={\tfrac {1}{3}}\left(u^{2}-v^{2}\right).\end{aligned}}}$$

The Weierstrass–Enneper parameterization is very simple, ${\displaystyle f(z)=1,g(z)=z}$, and the real parametric form can easily be calculated from it. The surface is conjugate to itself.

Implicitization methods of algebraic geometry can be used to find out that the points in the Enneper surface given above satisfy the degree-9 polynomial equation

$${\displaystyle {\begin{aligned}&64z^{9}-128z^{7}+64z^{5}-702x^{2}y^{2}z^{3}-18x^{2}y^{2}z+144(y^{2}z^{6}-x^{2}z^{6})\\&{}+162(y^{4}z^{2}-x^{4}z^{2})+27(y^{6}-x^{6})+9(x^{4}z+y^{4}z)+48(x^{2}z^{3}+y^{2}z^{3})\\&{}-432(x^{2}z^{5}+y^{2}z^{5})+81(x^{4}y^{2}-x^{2}y^{4})+240(y^{2}z^{4}-x^{2}z^{4})-135(x^{4}z^{3}+y^{4}z^{3})=0.\end{aligned}}}$$

Dually, the tangent plane at the point with given parameters is ${\displaystyle a+bx+cy+dz=0,\ }$ where

$${\displaystyle {\begin{aligned}a&=-\left(u^{2}-v^{2}\right)\left(1+{\tfrac {1}{3}}u^{2}+{\tfrac {1}{3}}v^{2}\right),\\b&=6u,\\c&=6v,\\d&=-3\left(1-u^{2}-v^{2}\right).\end{aligned}}}$$

$${\displaystyle {\begin{aligned}&162a^{2}b^{2}c^{2}+6b^{2}c^{2}d^{2}-4(b^{6}+c^{6})+54(ab^{4}d-ac^{4}d)+81(a^{2}b^{4}+a^{2}c^{4})\\&{}+4(b^{4}c^{2}+b^{2}c^{4})-3(b^{4}d^{2}+c^{4}d^{2})+36(ab^{2}d^{3}-ac^{2}d^{3})=0.\end{aligned}}}$$

The Jacobian, Gaussian curvature and mean curvature are

$${\displaystyle {\begin{aligned}J&={\frac {1}{81}}(1+u^{2}+v^{2})^{4},\\K&=-{\frac {4}{9}}{\frac {1}{J}},\\H&=0.\end{aligned}}}$$

${\displaystyle -4\pi }$

${\displaystyle \mathbb {R} ^{3}}$

${\displaystyle -4\pi }$

Another property is that all bicubical minimal Bézier surfaces are, up to an affine transformation, pieces of the surface.^[6]

It can be generalized to higher order rotational symmetries by using the Weierstrass–Enneper parameterization ${\displaystyle f(z)=1,g(z)=z^{k}}$ for integer k>1.^[3] It can also be generalized to higher dimensions; Enneper-like surfaces are known to exist in ${\displaystyle \mathbb {R} ^{n}}$ for n up to 7.^[7]

See also ^{[8] [9]} for higher order algebraic Enneper surfaces.