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Student Support Forum: 'Mathematica evaluation not completing' topicStudent Support Forum > General > "Mathematica evaluation not completing"

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Dean
07/29/12 12:51pm

Hi, I'm having a problem with Mathematica v8.0.0.0 (Windows).

What ought to be a very simple operation appears to be stuck in an infinite (or extremely long) evaluation.

The operation is this:

SolveAlways[ (a + b) (1 - r^2) + c r Sqrt[1 - r^2] == 0, {r}]

The obvious solution is {{a -> -b, c -> 0}}, but it never seems to get there. However if I swap the c with the (a+b) it then works fine:

SolveAlways[ c (1 - r^2) + (a + b) r Sqrt[1 - r^2] == 0, {r}]

rapidly yields: {{a -> -b, c -> 0}}


Is this a bug in Mathematica, or am I missing something here?

I'd appreciate some help, thanks.

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Subject (listing for 'Mathematica evaluation not completing')
Author Date Posted
Mathematica evaluation not completing Dean 07/29/12 12:51pm
Re: Mathematica evaluation not completing Bill Simpson 07/30/12 11:37am
Re: Re: Mathematica evaluation not completing Dean 07/31/12 11:52pm
Re: Mathematica evaluation not completing Forum Modera... 08/01/12 11:27am
Re: Re: Mathematica evaluation not completing Dean 08/02/12 4:11pm
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