On Sunday, November 24, 2013 4:32:45 PM UTC-5, Eric Gourgoulhon wrote:
> sage: M = Manifold(2, 'S^2') # 2 = dimension of the manifold
> sage: U = M.open_domain('U') # the complement of the North pole
> sage: stereoN.<x,y> = U.chart('x y', 'stereoN') # (x,y) = stereographic
> coord. from the North pole
>
Note that there is no need to repeat the 'x, y' labels here if you adjust
the argspec for U.chart a bit. The point of the R.<x> syntax is that the
coordinate names are supplied as strings as well as assigned to variables:
sage: preparse("stereoN.<x,y> = U.chart('stereoN')")
"stereoN = U.chart('stereoN', names=('x', 'y',)); (x, y,) =
stereoN._first_ngens(2)"
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