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Theta as the zero vector?

  1. Feb 18, 2012 #1
    I'm looking at a Linear Algebra book that is using the greek letter θ for the zero vector. And the book has other bold letters, so it can't be that they simply could not make a bold zero.

    Has anyone seen such a usage before?
  2. jcsd
  3. Feb 21, 2012 #2


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    sure. one of the reasons why, is because the 0-vector in a vector space might be rather "unusual". for example, the following is a vector space:

    V = R+ = {x in R: x > 0}

    the vector sum of x and y is defined to be xy,

    the scalar product of a real number c, and a vector x is defined to be: xc.

    in this vector space, the 0-vector is the real number 1.
  4. Feb 22, 2012 #3


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    It done so that you don't get confused between the number 0 and the vector 0.
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