MathGroup Archive 2005

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

Search the Archive

exact integer from Log[ ]

  • To: mathgroup at
  • Subject: [mg58321] exact integer from Log[ ]
  • From: "Trevor Baca" <trevorbaca at>
  • Date: Tue, 28 Jun 2005 05:13:22 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

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




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


  • Prev by Date: Common factors in a list
  • Next by Date: ListInterpolation
  • Previous by thread: Re: Common factors in a list
  • Next by thread: Re: exact integer from Log[ ]