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Math Help - Clarification on absolute value notation

  1. #1
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    Clarification on absolute value notation

    Not quite sure where this would fit best, but all uni calculus text books I've seen places this among the preliminaries, so it felt best here:

    I've frequently seen both |a| and ||a|| to denote the absolute value of a value or a vector, and I was wondering if there is any deeper significance to this or if it's merely a matter of preference?
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  2. #2
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    Re: Clarification on absolute value notation

    Quote Originally Posted by Scurmicurv View Post
    I've frequently seen both |a| and ||a|| to denote the absolute value of a value or a vector, and I was wondering if there is any deeper significance to this or if it's merely a matter of preference?
    We can argue about this. But yes, it is a matter of preference.

    I will tell you why i prefer \|\vec{a}\|. First it is a norm really.

    But also \|\beta\vec{a}\|=|\beta|\cdot\|\vec{a}\|. You see that distinguishes between the absolute value of a scalar and the norm of a vector.
    Thanks from topsquark
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  3. #3
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    Re: Clarification on absolute value notation

    Yea, I was thinking along those lines, but I felt a bit unsure about whether I was missing something. Thanks!
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