Re: exact integer from Log[ ]
- To: mathgroup at smc.vnet.net
- Subject: [mg58333] Re: [mg58321] exact integer from Log[ ]
- From: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>
- Date: Tue, 28 Jun 2005 21:56:34 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
FullSimplify[expr] will do it ! F.Jaccard -----Message d'origine----- De : Trevor Baca [mailto:trevorbaca at gmail.com] Envoyé : mardi, 28. juin 2005 11:13 À : mathgroup at smc.vnet.net Objet : [mg58321] exact integer from Log[ ] The question is how to get the exact integer 13 when we let f = 880*2^(1/12) and let expr = Log[2^(1/12), f/440] with no numerics (only exact integers) in both expressions. It seems that expr should already equal the integer 13 exactly, yet evaluating expr gives (12*Log[2*2^(1/12)])/Log[2] or Log[8192]/Log[2] with Simplify[expr], which, while clearly 13 to the eye, still isn't exactgly 13 on the page. So how do you get 13 back out of expr, preferably without recourse to numerics? Trevor.