Re: Help with Identities

*To*: mathgroup at smc.vnet.net*Subject*: [mg65613] Re: Help with Identities*From*: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>*Date*: Tue, 11 Apr 2006 04:04:21 -0400 (EDT)*Organization*: Uni Leipzig*References*: <e1ahdv$2j1$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, because SameQ[] === will test for identical elements You mean Equal[] and try Log[x/y] == Log[x] - Log[y] /. {{x -> 2, y -> 3}, {x -> 2, y -> 3 I}, {x -> -2 I, y -> 3 I}} // FullSimplify Regards Jens "Sven C. Koehler" <schween at snafu.de> schrieb im Newsbeitrag news:e1ahdv$2j1$1 at smc.vnet.net... | Hello! | | As an occasional mathematican, I sometimes forget that i.e. | | Log[x/y] is very similar to Log[x] / Log[y] | | Is there some way in Mathematica to see how an mathematical | expression could look like alternatively? (Something like the opposite | of Simplify.) | | And then I wonder why | | Log[x/y] === Log[x] - Log[y] | | is False. Can I instruct Mathematica to explain why this is False? | | Best wishes, | | Sven |