Hello,

>  sage: r = matrix(SR, 4, 4, [[21,17,6,8], [-5,-1,-6,-3], [4,4,16,2],
>  [2,3,-4,-1]])
>  sage: r.exp()
>  .....

This is happening since Maxima is failing to do the computation for
reasons that I don't know.  I suppose it wouldn't be too difficult to
write our own matrix exponentiation.

--Mike

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