[general]
name = Pseudosphere;
comments = Beltrami's Pseudosphere. Eugenio Beltrami (1835-1900).;
a1_min = -180;
a1_max = 180;
a1_steps = 40;
a2_min = 6; 
a2_max = 175;
a2_steps = 40;

[formula]
X = cos(A1) * sin(A2);
Y = cos(A2) + log(tan(A2/2));
Z = -sin(A1) * sin(A2);