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Can n! ever be negative?

  1. Dec 1, 2013 #1
    If yes, then for what values of n?
  2. jcsd
  3. Dec 1, 2013 #2
    We usually only define ##n!## for natural numbers ##n##. Then ##n!## can never be negative.

    There is however a very natural extension of the factorial, this is called the Pi function (which is just a translation of the Gamma function). This can indeed become negative as you can see from the graph: http://en.wikipedia.org/wiki/Gamma_function
  4. Dec 1, 2013 #3


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    If we extend the domain we can have negative numbers for example
  5. Dec 1, 2013 #4
    THAT is what I wanted to see. Thank you very much Sir.
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