An XCas question....

10142017, 06:58 AM
Post: #1




An XCas question....
I notice that the HP Prime CAS and XCas behave similarly (obviously) towards the following integral....
integrate(e^(a*x),x,0,+infinity) in that it only gives a defined answer if you run assume(RE(a)>0) beforehand, as 1/a result. However, if using Mathematica (Wolfram Alpha) when you give it the problem: integrate(e^(a*x),x,0,infiinity) it gives the result as 1/a for RE(a)>0 i.e. It figures out the conditions for a defined answer and presents them. I don't have to figure out that I need to use +infinity or RE(a)>0. The CAS system figures out the boundaries, instead of me having to know them in advance. The Wolfram Alpha system is a better system in that respect. I'm wondering is it a big deal for it to figure that out...i.e. I'd love for our CAS system to behave that way.... Here is what I'm talking about... http://www.wolframalpha.com/input/?i=int...,infinity) Thx Donald 

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