1. Earth Prime
    Joined
    16 Mar '05
    Moves
    35265
    07 Sep '05 13:16
    Originally posted by Suzianne
    ack, tried to make it a link but dunno the bracket code for it
    well... shouldn't feel bad. Thread ID links aren't possible and neither are URLs yet.
  2. London
    Joined
    30 Aug '05
    Moves
    1250
    08 Sep '05 16:23
    I'll teach you what it is then . 0! =
    That is blank because theoreticlly , you are using one number multiplying by a number that does not exist but I think Mr. Calculus should know why it is , its like 4p4 = 4! / 0!
    You already know that "p" means to "permutate" , so you know that
    npr where n and r are random numbers ,
    npr = n! / n-r!
    Therefore , 4p4 = 4! / 0!
    = 24 / 0!

    Full Info. on Permutation
    npr is a number .
    It is more difficult to simplify it to one number than be able to do something a "normal human" would not be able to do .
    First , we know by theory , npr = (n!) / (n-r)!
    Next , what is n! ? It is n (n-1) (n-2) (n-3) ... (n-r+1) (n-r) (n-r-1) ...
    3 x 2 x 1 so basiclly , its multiplying a number from itself down to 1.
    Point is now , that 0 is below 1 , so 1 is the least you can get out of it , I'm not sure what to do with negative integars but 0! is defeinately 1 .
  3. Standard membergenius
    Wayward Soul
    Your Blackened Sky
    Joined
    12 Mar '02
    Moves
    15128
    08 Sep '05 21:39
    Originally posted by Coconut
    Thread ID links aren't possible and neither are URLs yet.
    i think Russ has actually blocked the use of URL's purposefully, although i am not completly sure of this...
  4. Joined
    26 Apr '03
    Moves
    26771
    08 Sep '05 21:46
    Originally posted by Coconut
    0! is one? That's a new one for me.
    Factorials are number of arrangements of things. By convention we assume there is one way of arranging 0 things, which sort of makes sense.
  5. London
    Joined
    30 Aug '05
    Moves
    1250
    09 Sep '05 16:28
    The factorial of negative numbers will defenately be a strange and medicore number . It may be either of these :
    The Number itself
    0
    1
    -1
    Infinite
    i
    or some really wierd number.
  6. Joined
    13 Jan '05
    Moves
    2279
    20 Sep '05 02:28
    you can not take the factorial of a negative number. They are undefined.
  7. Joined
    15 Mar '05
    Moves
    3095
    05 Oct '05 03:32
    Originally posted by GWUchessmaster
    you can not take the factorial of a negative number. They are undefined.
    He was probably talking about the Gamma function. Gamma(X) = (X - 1)! if X is an integer. The Gamma function is defined for some negatives. It is also defined for all positive Reals.
  8. Standard memberXanthosNZ
    Cancerous Bus Crash
    p^2.sin(phi)
    Joined
    06 Sep '04
    Moves
    25076
    05 Oct '05 05:11
    Originally posted by rheymans
    He was probably talking about the Gamma function. Gamma(X) = (X - 1)! if X is an integer. The Gamma function is defined for some negatives. It is also defined for all positive Reals.
    Gamma(X) = Int(x,inf,0) x^(n-1) * e^-x dx

    Where Int(x,inf,0) is the integral between x=infinity and x=0
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