Help to build a function to approximate a expression when X >> Y
Subject: Help to build a function to approximate a expression when X >> Y
From: Andrey Siver
Date: Wed, 3 Oct 2007 13:16:52 +0400
----- Original Message -----
From: "Javier Sanchez" <javier_home at terra.es>
To: "Stavros Macrakis" <macrakis at alum.mit.edu>
Cc: <maxima at math.utexas.edu>
Sent: Tuesday, October 02, 2007 9:43 PM
Subject: Re: [Maxima] Help to build a function to approximate a expression
when X >> Y
> After expand I always get my original simplified form.
>
> In general I can not assume a*x >> b*y. However, if x >> y then b*x >>
> b*y and I can drop this term.
If you cannot assume a*x >> b*y, then you should probably consider the case:
a << b with the same technique that I recommended you in the last email. But
also you should know whether a or b depends on x or y (and make the
variables change correctly).
Best regards,
-Andrey