Thank's Tom and Marco. 
The equations, as shown in Wikipedia,  https://en.wikipedia.org/wiki/Scherk_surface, are the same as in the Scherk2 script.
 
The equations are the comprehensible result of some mathematician managing to integrate the nearly 
incomprehensible Weierstrass–Enneper parameterization. 
 https://en.wikipedia.org/wiki/Weierstrass%E2%80%93Enneper_parameterization
For some other minimal surfaces, like Costa and Gyroid (I think), the integration must be done  numerically, programmed with some 
program like Mathematica.  The programs create a triangle mesh, not NURBS.
 
- Brian
 
This Half version looks better, and uses zero.  It can be Networked.
 
Scherk2WWalfToRotate01 
_FxGraph3D log((1+u*u+2*u*cos(v)) / (1+u*u-2*u*cos(v))); log((1+u*u-2*u*sin(v)) / (1+u*u+2*u*sin(v))); 2*atan((2*u*u*sin(2*v)) / (u*u*u*u - 1));0;0.8;0;3.141592653589793;24;48;1;;;UV  
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