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Homework Help: Vectors, linear algebra

  1. Jan 19, 2009 #1
    given the vectors,

    show that if v1,v2......vk+1. are dependant then v1,v2......vk+1 are definitely dependant.

    can i say that in a series of dependant vectors, at least one must be a linear combination of the others therefore, if v1,v2......vk+1 are dependant, v1,v2......vk+1 must be since it contains the vector which was a linear combination (from the larger series)
  2. jcsd
  3. Jan 19, 2009 #2


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    Gold Member

    What is definitely dependant?
  4. Jan 19, 2009 #3


    Staff: Mentor

    I think you have written the problem incorrectly. My guess is that this is the problem:

    Given the vectors, v1,v2,...,vk+1,
    show that if v1,v2,...,vk+1 are linearly dependent, then v1,v2,...,vk are linearly dependent.

    To answer your question, yes, in any collection of linearly dependent vectors, it must be the case that one of them is some linear combination of the rest.
  5. Jan 20, 2009 #4
    Huh? In R^2 the vectors (1,0), (0,1), (1,1) are linearly dependent, but (1,0) and (0,1) are linearly independent.
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