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2013-11-19 11:37:20 +0200	marked best answer	Combine two 3d plots You have a very small typo. `==` is for an equation, but `=` is for keywords. Try this. `var('x,y,z') implicit_plot3d(x^2+y^2+z^2==4, (x, -3, 3), (y, -3,3), (z, -3,3)) + implicit_plot3d(x^2+y^2+1.75^2==4, (x, -3, 3), (y, -3, 3), (z, -3, 3))`
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2013-11-19 08:40:42 +0200	asked a question	Combine two 3d plots It's possible to combine two 2d plots in one: `sum([plot(x^n,(x,0,1),color=rainbow(5)[n], figsize=3) for n in range(5)])` How can this be done for 3d plots? For example, I tried this: `implicit_plot3d(x^2+y^2+z^2==4, (x, -3, 3), (y, -3,3), (z, -3,3)) + implicit_plot3d(x^2+y^2+1.75^2=4, (x, -3, 3), (y, -3, 3), (z, -3, 3))` But it generates this error: `File "<ipython-input-8-6cd08d1c769f>", line 1 SyntaxError: keyword can't be an expression`