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MaplePrimes Activity

These are replies submitted by vogs

Thank you very much! So the keyword "formal" is the key!

I tried a second one and that took me even longer to get a sufficient convergence condition. I wasn't able to find one condition so I managed it this way:

sum(k*Ta*exp(a*k*Ta)*z^(-k),k=0..infinity) assuming Ta>0, a<0, z>1;

But as you said, it works better with formal:

sum(k*Ta*exp(a*k*Ta)*z^(-k),k=0..infinity, formal);


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