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-   -   Incorrect Mathematica Double Integral (https://www.mersenneforum.org/showthread.php?t=4838)

jinydu 2005-10-14 06:31

Incorrect Mathematica Double Integral
 
Mathematica claims that:

[tex]\Large\int_{0}^{1}\int_{0}^{1}\sqrt{x^3+y^3}dxdy=0.571374-0.0367996i[/tex]

Obviously, we expect a real-valued answer. What could have went wrong?

ColdFury 2005-10-14 07:12

My Mathematica says the answer is roughly 0.635113. I would check your input for errors.

jinydu 2005-10-14 07:46

1 Attachment(s)
No doubt about it, I typed it in correctly.

EDIT: Now that's irritating. I went back to the image file and increased its size, but it still displays very small here.

ColdFury 2005-10-14 10:05

1 Attachment(s)
What version of Mathematica are you using? Mine is 5.

jinydu 2005-10-15 05:48

[QUOTE=ColdFury]What version of Mathematica are you using? Mine is 5.[/QUOTE]

I'm using 4. If I want a legal version of 5, I will have to pay a lot of money...

TTn 2005-10-16 01:03

I'm running version 5(trial cracked).
For evaluation ofcourse.

I'm getting the same as ColdFury.
If you paid money for verision 4, then maybe you want it back!
Or maybe the crack is wrong. ColdFury cracked?

ColdFury 2005-10-16 02:26

No, my software is legal.

TTn 2005-10-16 04:03

So is mine.

ColdFury 2005-10-16 07:47

[QUOTE=TTn]So is mine.[/QUOTE]

Didn't you just say you were running a cracked trial?

TTn 2005-10-16 10:12

It's sort of a long story, so I'd like to prevent an argument about it.
I ordered the trial legally, and never really got to use it, because windows needed to re-installed 2 days later. Doubt it was mathematicas fault though.
I was supposed to recieve another copy, after contacting them about my problem, but they never sent one. A few months passed by and I forgot about it.

So I took it upon myself to use the honor system.
BTW, It's not illegal, here in NH
to run software on my computer.("Live free or die")
Redistribution, dissesembly, reverse engineering,
or sale would constitute a violation.
There may be some grey areas here, but they are open to interpretation.
So I modified an existing crack found online, to try out the software.
I dont' really like it, although it can be used occasionally as a trial, or test in this case. So far I've used it a few days total.

Trial versions should really go by actual useage anyway.
But this would complicate things for the company, so they tend to side against the consumer.

Again please, I dont want to argue about how what I'm doing is illegal or immoral. It's not, I don't use it.
A rebuttle is fine, but don't bash me for it.

ColdFury 2005-10-16 22:09

I'm not going to argue, you can do as you please. I just wanted clarification.


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