## 25 Reputation

11 years, 37 days

## Thank you...

@Carl Love Thank you.But on my computer it took about 30 minutes.Why?

## Thank you...

@Carl Love Thank you for reminding

## Not a series expansion...

@Markiyan Hirnyk My difficulty is that integration spend time too long , not series expansion.Thank you!

## Further solving...

@Preben Alsholm Yes,you right.Howvere,how to solve the error? or solving the equation ode with other numerical algorithms in maple?Thank you.

## other invlaplace...

Thank you for your help.But I have another question.How to invlaplace the following expression？
>res:=1/(s^2)*(exp((1/2)*C3+(1/2)*sqrt(C3^2+4*C1*s)+eta*sqrt(C3^2+4*C1*s))-exp((1/2)*C3+(1/2)*sqrt(C3^2+4*C1*s))+exp(sqrt(C3^2+4*C1*s))-exp(eta*sqrt(C3^2+4*C1*s)))*(-s+exp(C4))*(Sum(-e^(sqrt(C3^2+4*C1*s)*k), k = 0 .. infinity))*exp(-(1/2*(C3+sqrt(C3^2+4*C1*s)))*eta)

## other invlaplace...

Thank you for your help.But I have another question.How to invlaplace the following expression？
>res:=1/(s^2)*(exp((1/2)*C3+(1/2)*sqrt(C3^2+4*C1*s)+eta*sqrt(C3^2+4*C1*s))-exp((1/2)*C3+(1/2)*sqrt(C3^2+4*C1*s))+exp(sqrt(C3^2+4*C1*s))-exp(eta*sqrt(C3^2+4*C1*s)))*(-s+exp(C4))*(Sum(-e^(sqrt(C3^2+4*C1*s)*k), k = 0 .. infinity))*exp(-(1/2*(C3+sqrt(C3^2+4*C1*s)))*eta)

## Thanks！...

Thank you very much!It is very helpfull.

## Thanks！...

Thank you very much!It is very helpfull.

Thank you very

Thank you very

## Thank you...

Thank you for your well replay

## Thank you...

Thank you for your well replay

## Simplify the problem...

@Markiyan Hirnyk Yes，you are right.Moreover,now if I only want to konw all the residue of res,how to do this?

## Simplify the problem...

@Markiyan Hirnyk Yes，you are right.Moreover,now if I only want to konw all the residue of res,how to do this?

## On complex...

Yes,, the integral of res over the reals diverges.But if on complex?

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