Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Help with Identities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65596] Re: Help with Identities
  • From: Bhuvanesh <lalu_bhatt at yahoo.com>
  • Date: Mon, 10 Apr 2006 02:31:16 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

As for the second question, Log[x/y] and Log[x]-Log[y] are related by:

Log[x/y] == Log[x] - Log[y] + 2*Pi*I*Floor[(Pi - Arg[x] + Arg[y])/(2*Pi)]

For x>0 && y>0 the Floor term vanishes.

In[1]:= Simplify[Log[x]-Log[y]-Log[x/y], x>0 && y>0]

Out[1]= 0

Bhuvanesh,
Wolfram Research.


  • Prev by Date: Re: Help with Identities
  • Next by Date: Re: Axes with arrowheads !?
  • Previous by thread: Re: Help with Identities
  • Next by thread: Re: Help with Identities