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sage: from sage.plot.plot3d.parametric_surface import ParametricSurface, MobiusStrip sage: def f(r,t): return r*cos(t), r*sin(t), r^2 sage: P = ParametricSurface(f, (srange(0,5,0.1), srange(0,6.4,0.1))) sage: show(P)
