> sage: matrix(SR, 3, 3, [[21,17,6],[-5,-1,-6],[4,4,16]]).exp()
>
> [ (13*e^16 - e^4)/4 (13*e^16 - 5*e^4)/4 (e^16 - e^4)/2]
> [ (e^4 - 9*e^16)/4 (5*e^4 - 9*e^16)/4 (e^4 - e^16)/2]
> [ 4*e^16 4*e^16 e^16]
>
this does not work for 4x4 matrices, try
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()
.....
Georg
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