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Exp[π] - π

  1. Apr 7, 2008 #1
    I read somewhere that [itex]e^\pi - \pi = 20[/itex].

    1. Is it true?
    2. I tried finding out.. but all i've reached till is:

    e^{\pi} = \cos{(i \pi)} - i \sin{(i \pi)}

    what do i do from here on>
  2. jcsd
  3. Apr 7, 2008 #2


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    Probably it was an engineer who told you :smile:
    The difference with 20 is about 9.00021 x 10-4. So it's an approximate equality (which is, for a mathematician, of course not an equality).
  4. Apr 7, 2008 #3

    Gib Z

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    It's a nice example of an "almost integer". Mathworld has a nice on them, its got many other expressions that are "almost integers" like yours.
  5. Apr 7, 2008 #4
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