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Math Help - Quick Question about Vector Notation

  1. #1
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    Quick Question about Vector Notation

    I'm currently in the 4th week or so of my "Calculus 3/Multivariable Calculus" class and I learned about 2 ways to multiply vectors, the cross product and the dot product.

    I often see this kind of notation though in my book (assume a, b, and c are vectors and not scalars) where it'll be something like (a x b)c. How do I multiply the cross product of vector a x b to c when I don't know which kind of multiplication to use?

    Thanks for your time and help.
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by PeterTheBohemian View Post
    I'm currently in the 4th week or so of my "Calculus 3/Multivariable Calculus" class and I learned about 2 ways to multiply vectors, the cross product and the dot product.

    I often see this kind of notation though in my book (assume a, b, and c are vectors and not scalars) where it'll be something like (a x b)c. How do I multiply the cross product of vector a x b to c when I don't know which kind of multiplication to use?

    Thanks for your time and help.
    I think they're referring to \left(a\times b\right)\cdot c. Otherwise, that wouldn't really make sense since you can't use regular multiplication when "multiplying" vectors.

    Also, note that \left(a\cdot b\right)c is valid since a\cdot b is a scalar.

    Does this help? If not, please post back.
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  3. #3
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    Thanks Chris. I just needed someone else to think "That doesn't make sense." I must have just misread my professor's writing or something, because I understand the concept of how you can't cross multiply a vector and a scalar.
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