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Math Help - Simple question about angle between two vectors

  1. #1
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    Simple question about angle between two vectors

    http://upload.wikimedia.org/math/7/7...8706d780f6.png
    What do the two lines on each side of the vectors mean?
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  2. #2
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    They mean the absolute value of u and v i.e, u and v are non-negative.
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  3. #3
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    those aren't absolute values, those are norms.

    See

    http://en.wikipedia.org/wiki/Norm_(mathematics)
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  4. #4
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    Indeed, apparently im a bit rusty on the old geometry.
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