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Homework Help: Remember e ?

  1. Oct 28, 2008 #1
    1. Some one here remember what e's exact value is ? How long is the after.point.digits extended by mathematicians ?

    2. e=2.79

    3. I just remember e=2.79, I am not sure of such also

    Thanks for any answer
  2. jcsd
  3. Oct 28, 2008 #2
    e^1 = 2.718281828
  4. Oct 29, 2008 #3


    Staff: Mentor

    No one here (or in fact, anywhere) remember's e's exact value. :smile:

    Its decimal representation has infinitely many digits after the decimal point, with no repeating pattern.
  5. Oct 29, 2008 #4


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    Science Advisor

    I do. It's "e". The fact that, in a particular numerical representation, it has an infinite number of digits has nothing to do with "remembering" it.
  6. Oct 29, 2008 #5


    Staff: Mentor

    In that case, I remember the exact values of pi and phi as well. However, I (reasonably) inferred from lonton's question that he meant the decimal representation.
  7. Oct 29, 2008 #6


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    Gold Member

    HallsofIvy is correct about the variables being the only exact way of expressing the most accurate value; however, without being sarcastic, I assume you just want a list of digits, which is available through NASA. I don't think that there is a "typical" amount of digits that people round to, although I do know that the College Board requires final answers to be accurate to three decimal places - so just pick whatever will still get you that accurate if you're not in a really advanced math class or doing this for your job (in that case, use as many as possible).

    I just keep things in "e" form, though, if that makes sense. It's more exact.
  8. Oct 29, 2008 #7


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    Science Advisor

    2.7 1828 1828 45 90 45 235 360

    I memorized these digits of e many years ago. The repeating block 1828 is a big help, of course; this is followed by three well known angles (in degrees), followed by the course number of the calculus class I happened to be taking at the time, followed by another well known angle.

    I've never been able to memorize the next digit, though.
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