CONFIG

tracktype: 1;


sharpendigits:24;

imagthreshold: 1e-4;
END;

INPUT

variable_group x, y, z, u, v;

function f1, f2, crit;

r_squared = x^2+y^2+z^2;
f1 = r_squared-1-u^2;
f2 = r_squared-4+v^2;

% now need the critical condition.  we'll use 
crit = -4*u*v;

END;
