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Homework Help: What is a determinant?

  1. Jan 13, 2008 #1
    What does a determinant do exactly (what is it)? And what is the general method of calculating it?
  2. jcsd
  3. Jan 13, 2008 #2
    The determinant is mainly used to determine whether or not a square matrix is invertible. There are other applications as well. (ie. Cramer's rule for determining solutions to a system of linear equations)

    The method used is generally the http://tutorial.math.lamar.edu/Classes/LinAlg/MethodOfCofactors.aspx" [Broken] (note link)
    Last edited by a moderator: May 3, 2017
  4. Jan 13, 2008 #3
    hmm...I see...I've practically forgotten the concept of matrices, but thanks. If possible, do you know of a site that simply goes through the fundamentals of matrices? And (this question is slightly random)....what is a lattice point?
  5. Jan 13, 2008 #4
    Last edited by a moderator: May 3, 2017
  6. Jan 13, 2008 #5
    Thanks for the help.
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