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}]
