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I have two question.

  1. Oct 21, 2007 #1
    Hi every one, I have two questions, I hope some one can help me.
    Thanks.

    How can I distinguish between a maximum, minimum or a saddle?

    When are times when a particular coordinate system is a better choice the n the other two (rectangular, cylindrical and spherical)?
     
  2. jcsd
  3. Oct 21, 2007 #2

    EnumaElish

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    You could start by writing out the definition for each.
     
  4. Oct 21, 2007 #3
    but I dont know the definition
     
  5. Oct 21, 2007 #4
    A minimum occurs when the Hessian is positive definite, a maximum when it is negative definite, and a saddle point when the Hessian has positive and negative eigenvalues.
     
  6. Oct 21, 2007 #5
    Thanks ^_^
    How about my second question:

    When are times when a particular coordinate system is a better choice the n the other two (rectangular, cylindrical and spherical)?
     
  7. Oct 21, 2007 #6

    EnumaElish

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  8. Oct 21, 2007 #7

    EnumaElish

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    I am assuming this is not homework. If it is, this thread will probably be deleted.
     
  9. Oct 21, 2007 #8
    Well I need to know this so I can do my homework
    Thanks ^_^
     
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