Works in Mathematica

[jebem]

(03-03-2014 07:46 PM)dan_h Wrote:  I didn't know that command existed, but it is in the Prime and HP 50G. So, I typed Assume(s>0), and then used the integral template following the comma. Answer:

[s 1/2].

Ok, I tried the second variant of the original expression on the HP-Prime. So, if now the expression is:

assume(s>0); int(exp(-(s*t)),t,0,inf)

This time the Prime can find the answer for this definite integral: s 1/s

Also, if we try the indefinite integral, the Prime answer seems OK, and it is exactly the same as one can find in wolframalpha:
https://www.wolframalpha.com/input/?i=in...0%2Cinf%29

So, the only issue here is to find out why the Prime is not able to find the answer for the original expression posted here:
assume(s<0); int(exp(s*t),t,0,inf)