Hi all i need a little help with Jordan form

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The user has diagonalized the matrix A and obtained the Jordan form J as J=[-1 0 0; 0 2 1; 0 0 2]. They seek clarification on calculating e^Jt, specifically the first row's elements, due to confusion from a mathematics book. The corrected matrix for e^Jt is proposed as [[e^-t, t*e^t, 1/2*t^2*e^t], [0, e^2t, t*e^t], [0, 0, e^2t]]. The user is uncertain about the accuracy of the elements in the first row. The discussion highlights the complexities of matrix exponentiation in the context of Jordan forms.
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ok this is my problem...
i have diagonalized the A matrix with the equation P^-1*A*P
and the result is J=[-1 0 0;0 2 1; 0 0 2]. in order to find the e^Jt do i need to do the following? =>


[-e^t t*e^t 1/2*t^2 *e^t

0 2*e^t t*e^t

0 0 2*e^t]


I am not sure about the 2 and 3 elements in the first row of the matrix since i have zeros at the J matrix but a mathematics book confused me..

Thanks in advance..
 
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i did a mistake this is the matrix..

[e^-t t*e^t 1/2*t^2 *e^t

0 e^2t t*e^t

0 0 e^2t ]
 
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