Re: Sqrt[R^2]
- To: mathgroup at smc.vnet.net
- Subject: [mg42751] Re: Sqrt[R^2]
- From: Yves Klett <yk at despammed.com>
- Date: Fri, 25 Jul 2003 05:07:57 -0400 (EDT)
- Organization: Comp.Center (RUS), U of Stuttgart, FRG
- References: <bfl2q4$shh$1@smc.vnet.net> <bfo4eb$cbt$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Yves Klett schrieb: > Prechtl Josef schrieb: > >>How can I instruct Mathematica when simplifying expressions to convert >>expressions e.g. Sqrt[R^2] into R? i.e. only to restrict to the case >>that the variable R is a positive real? >> >>thank you in advance for any help! >> > > All right, with this one even I might be able to help: > Use an assumption like > > Simplify[Sqrt[r^2], r > 0] > ****** > > which should give r. > > Good luck, > Yves > Sorry, forgot about the real - look at Bills solution.