On 03/29/2010 07:23 AM, Jason Grout wrote:

On the other hand, I think it would fairly straightforward for QQbar
objects to print out quadratic roots (that it knows are quadratic roots)
in the above format (using the quadratic equation), instead of using the
interval notation. It'd probably one or two if-cases in the printing code.


See http://trac.sagemath.org/sage_trac/ticket/8626 for a short patch which implements this in simple cases, so we get:

sage: QQbar(sqrt(5))
sqrt(20)/2
sage: m=matrix(2,2,[0,1,1,1]);m
[0 1]
[1 1]
sage: m.eigenvalues()
[(1-sqrt(5))/2, (1+sqrt(5))/2]
sage:

Thanks,

Jason

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