Catalan Minimal Surface
Written by Paul Bourke
December 2000

x = c (u  cosh(v) sin(u))
y = c (1  cosh(v) cos(u)
z = 4 c sin(u/2) sinh(v/2)
infinity <= u <= infinity
infinity <= v <= infinity

The Catalan minimal surface (zero mean curvature) is
attributed to Eugene Catalan around 1855.
