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Simplify the following mathematical computation?

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hi . i have a code . it's processing is too hard for mathematica. becuse mathematica could not solve it after 1 hour. how i can make it easy for Processing ? (pintial is a matrix in this code)

<pre>
 Sum[(t/r)^k*1/Factorial[k]*
   MatrixPower[H,  k].MatrixExp[-I*H*t].MatrixExp[(-t/2*r)*MatrixPower[H, 2]].pintial.ConjugateTranspose[ MatrixPower[H, 
       k].MatrixExp[-I*H*t].MatrixExp[(-t/2*r)*
        MatrixPower[H, 2]]], {k, 1, Infinity}]
POSTED BY: reza hamzeh
Answer
9 days ago

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