Simplifying formal expression thanks to numerical value



On 29-08-2013 14:54, vincent binet wrote:
> i know that c is negligible compared to b (i.e. c/b << 1), so i'm 
> looking to a maxima function that will give me the results
> expr: a*sqrt(b)
Hi,
in addition to Richard Fateman's suggestion, this will also do the trick:

(%i7) limit (ratsubst (d, c/b, expr), d, 0);
(%o7) a*sqrt(b)

Regards,
Jaime