help! How to make Maple cancel the common expressions?

Luna Moon

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Nov 12, 2009, 1:26:52 PM11/12/09

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help! How to make Maple cancel the common expressions in both
denominator and numerator?

As you could see, there is a g^(2/3) which is a common factor...

http://yfrog.com/0rexpression2j

A N Niel

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Nov 13, 2009, 7:42:25 AM11/13/09

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In article
<01c939f7-d35c-42fc...@g22g2000prf.googlegroups.com>,
Luna Moon <lunamo...@gmail.com> wrote:

If provided in machine-readable form, we could try it out and see if we
could do it.

RRogers

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Nov 13, 2009, 9:55:43 AM11/13/09

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It seems that you could define g'=g^(1/3) and almost have a polynomial.

Luna Moon

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Nov 13, 2009, 9:59:19 AM11/13/09

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On Nov 13, 4:42 am, A N Niel <ann...@nym.alias.net.invalid> wrote:
> In article
> <01c939f7-d35c-42fc-8dca-ddd9ca692...@g22g2000prf.googlegroups.com>,

>
> Luna Moon <lunamoonm...@gmail.com> wrote:
> > help! How to make Maple cancel the common expressions in both
> > denominator and numerator?
>
> > As you could see, there is a g^(2/3) which is a common factor...
>
> >http://yfrog.com/0rexpression2j
>
> If provided in machine-readable form, we could try it out and see if we
> could do it.

Okay, here is an example:

-(1/12)*(-g*vb-g+z*g-g^(2/3)*z+g^(2/3)*vb)*(g^(1/3)+1)^5/g^(2/3)

Just wanted to get rid of the denominator...

Luna Moon

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Nov 13, 2009, 10:00:11 AM11/13/09

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OKay, suppose I have a very complicated expression involving g^(1/3)
and g^(2/3), how do I replace all those factors using g' in Maple?

Thanks

A N Niel

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Nov 13, 2009, 10:52:59 AM11/13/09

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In article
<01ed49b0-fb1c-4aaa...@h40g2000prf.googlegroups.com>,
Luna Moon <lunamo...@gmail.com> wrote:

A := -(1/12)*(-g*vb-g+z*g-g^(2/3)*z+g^(2/3)*vb)*(g^(1/3)+1)^5/g^(2/3);

expand(A);

no denominator

Luna Moon

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Nov 13, 2009, 11:02:24 AM11/13/09

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On Nov 13, 7:52 am, A N Niel <ann...@nym.alias.net.invalid> wrote:
> In article

> <01ed49b0-fb1c-4aaa-a535-ba9a0f42f...@h40g2000prf.googlegroups.com>,

>
>
>
> Luna Moon <lunamoonm...@gmail.com> wrote:
> > On Nov 13, 4:42 am, A N Niel <ann...@nym.alias.net.invalid> wrote:
> > > In article
> > > <01c939f7-d35c-42fc-8dca-ddd9ca692...@g22g2000prf.googlegroups.com>,
>
> > > Luna Moon <lunamoonm...@gmail.com> wrote:
> > > > help! How to make Maple cancel the common expressions in both
> > > > denominator and numerator?
>
> > > > As you could see, there is a g^(2/3) which is a common factor...
>
> > > >http://yfrog.com/0rexpression2j
>
> > > If provided in machine-readable form, we could try it out and see if we
> > > could do it.
>
> > Okay, here is an example:
>
> > -(1/12)*(-g*vb-g+z*g-g^(2/3)*z+g^(2/3)*vb)*(g^(1/3)+1)^5/g^(2/3)
>
> > Just wanted to get rid of the denominator...
>
> A := -(1/12)*(-g*vb-g+z*g-g^(2/3)*z+g^(2/3)*vb)*(g^(1/3)+1)^5/g^(2/3);
>
> expand(A);
>
> no denominator

Thanks. I am thinking that the best way to go is to define g1=g^(1/3),
g2=g^(2/3) and then replace all those items...

how to do that in Maple?

Thanks!

Ray Vickson

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Nov 13, 2009, 2:07:01 PM11/13/09

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Do it in the standard way: subs({g^(1/3) = g1, g^(2/3) = g2},expr);
However, if you had an expression containing, say g^(4/3) as well,
Maple would just leave it, rather than writing g1^4 or g2^2.

Judging from the questions you have been posting here, it seems that
you would benefit greatly form a BOOK on Maple usage.

R.G. Vickson

>
> Thanks!