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Re: Finding an exponent?

• To: mathgroup at smc.vnet.net
• Subject: [mg112360] Re: Finding an exponent?
• From: Peter Breitfeld <phbrf at t-online.de>
• Date: Fri, 10 Sep 2010 06:25:15 -0400 (EDT)
• References: <i6crg4$sak$1@smc.vnet.net>

AES wrote:

> Given  Exp[ expr ]  where   expr  is some complex expression in Standard 
> form, how can I get  expr  itself in an Input cell?   (Preferably 
> unevaluated, and other than using manual Copy and Paste).
>
> Log[Exp[expr]] doesn't seem to do it.
>

You have several possibilities:

bla=Exp[(1 + a/b) (c + d^2) - 7]

Log[bla]//PowerExpand

bla[[2]]

bla/.Power[E,x__]:>x


-- 
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de