Works in Mathematica

[jebem]

(03-02-2014 03:49 PM)parisse Wrote:  Your answer or your input is wrong. You must make an assumption on s to get an answer: assume(s<0); int(exp(s*t),t,0,inf)

Thanks, Parisse, to take your time to help us.

I have both calculators, so I decided to test it as well.

The HP-50G has no issues finding the answer, using your solution, but using the 50G uppercase commands and variables syntax - Got the mentioned answer: -1/S

However the HP-Prime is another different kind of "animal".
I tried in CAS (Radians), one expression at a time, and then both expressions in a single line as suggested, and then I have used the "infinite" symbol in place of "inf", and at last I used the Prime integral template, but the only answer I can get from it is:
"Undef/Unsigned Inf encountered in limit"
Also, it doesn't matter if I use the "assume(s<0)" sentence or not, the above result is the only thing I can get from it. In fact, the answer Prime is giving to "assume(s<0)" is just "s".

This only tells me that I'm not really prepared to deal with the Prime, as it seems it is too picky and requires so much more understanding of it before one can really use it with more success.

Anyone can get a good answer using the Prime for this integral and share how to do it?