Re: Re: Simplify with NestedLessLess?
- To: mathgroup at smc.vnet.net
- Subject: [mg106560] Re: [mg106521] Re: [mg106487] Simplify with NestedLessLess?
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Sat, 16 Jan 2010 06:12:26 -0500 (EST)
- References: <23979164.1263466810832.JavaMail.root@n11>
- Reply-to: drmajorbob at yahoo.com
In that case, use Limit... or NLimit... or Series. Bobby On Fri, 15 Jan 2010 02:19:16 -0600, Dave Bird <dbird at ieee.org> wrote: > Thanks David. Good point. > > But, my example was just to illustrate in principle. My actual needed > usage is in much more complicated expressions. > > Thanks again, > > Dave > > David Park wrote: >> Why should it Simplify d? NestedLessLess has no built-in meaning. And >> even >> if it did mean that b << a there is no reason that Mathematica should >> still >> set b to zero. It doesn't even know if a and b are real positive. You >> will >> have to set it to zero yourself. >> >> d /. b -> 0 >> a >> >> For more complicated expressions you might have to use Limit. >> >> >> David Park >> djmpark at comcast.net >> http://home.comcast.net/~djmpark/ >> >> >> >> From: dbird [mailto:dbird at ieee.org] >> >> Please excuse if this has been answered before, but I can't find it. >> >> Is there some way to do a Simplify with assumptions using a >> NestedLessLess or something similar? For example: >> >> d=a+b >> Simplify[d,NestedLessLess[a,b]] >> >> Answer is: >> a+b >> >> Answer should be: >> b >> >> Thanks, >> >> Dave >> >> >> >> > -- DrMajorBob at yahoo.com