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# Re: calculation (Perhaps Solve could do more with rational exponents???)
*To*: mathgroup@smc.vnet.net
*Subject*: [mg12062] Re: calculation (Perhaps Solve could do more with rational exponents???)
*From*: "Wendy Hartman" <wendytangoalephzero@worldnet.att.net>
*Date*: Fri, 24 Apr 1998 01:52:32 -0400
*Organization*: AT&T WorldNet Services
*References*: <6gr69a$8lo@smc.vnet.net>
Solve[r^(5/2)/((r^(1/2)-1)^(1/3))==a,r] results in roots of a 15th order
polynomial (taking only a fraction of a second), while
Solve[r^(5/2)/((r^(1/3)-1)^(1/3))==a,r] had to be abended for spending
far more time and memory than seemed reasonable (Pentium II 266MHz w/
128 MBytes). Making an "obvious" transformation
Solve[x^(15/2)/((x-1)^(1/3))==a,x]
results in roots of a 45th order polynomial (taking only a fraction of a
second)
To (my)(IMHO etc) human eyes both equations seem of "equal"
complexity... could Solve be extended to be more aggressive with
expressions involving rational powers???
Saeed Esmaily Rashid <saeedr@stud.ntnu.no> wrote in article
<6gr69a$8lo@smc.vnet.net>...
> Hello!
>
> My name is Saeed and i'm studying physics. I have a problem which ihope
> someone can help me with it. I have an equation
>
> .001422409738*R^(73/80)*(R^(1/2)-1)^(-13/40) == .04
>
> i'm using the Solve function in Mathematica 3.0 to solve it for R, but
> it calculats endlessly and takes very long time. the question is that
> is there any way to optimize this equation or using another function in
> Mathematica 3.0 to make it faster to calculate?
>
> Regards
>
>
>
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