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  1. Newbie
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    #1

    how to express multiplication of n numbers

    hello, everyone. Given n numbers a_i (i=1...n), how to exactly express multiplication of n numbers?
    which one of the following expressions is best? Or you have any other suggestions?
    "multiplication of a_is"
    "multiplication of a_i"
    "series multiplication of a_is"
    "series multiplication of a_i"

  2. Offroad's Avatar
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    #2

    Re: how to express multiplication of n numbers

    The product of the elements of vector a is n!.

  3. Raymott's Avatar
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    #3

    Re: how to express multiplication of n numbers

    Quote Originally Posted by Offroad View Post
    The product of the elements of vector a is n!.
    Yes, called 'factorial n'.
    Does 'a_i' mean "series a with integer elements i"?
    If so, factorial a_i (i=1...n) means factorial n.
    Last edited by Raymott; 14-Jan-2010 at 07:51.

  4. Newbie
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    #4

    Re: how to express multiplication of n numbers

    a_i stands for a series of numbers with subscript i, and i runs from 1 to n. a_i is not i itself.

  5. Offroad's Avatar
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    #5

    Re: how to express multiplication of n numbers

    Quote Originally Posted by doty View Post
    a_i stands for a series of numbers with subscript i, and i runs from 1 to n. a_i is not i itself.
    The product of the elements of vector a is p, p = a(1)*a(2)*...*a(n-1)*a(n).

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