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Math Help - Help me

  1. #1
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    Help me

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  2. #2
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    Re: Help me

    Quote Originally Posted by soso123 View Post
    What sort of object is u=(1,-2i,3+i)~? Are those complex numbers?

    What operation is involved with |\overline{u}|~?
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  3. #3
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    Re: Help me

    Is this for a "several complex variables" class? I checked out the definition of modulus of u in C^3 (just let n=3 for your case):

      |u|=\sqrt{ \sum_{i=1}^{3} {|u|}_i^2}

    where  u_i = x_i + i*y_i and   {|u|}_i is the usual modulus of a complex number

    Just apply to your u-bar
    Last edited by chen09; September 24th 2013 at 01:32 PM.
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  4. #4
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    Re: Help me

    Quote Originally Posted by chen09 View Post
    Is this for a "several complex variables" class? I checked out the definition of modulus of u in C^3 (just let n=3 for your case):
      |u|=\sqrt{ \sum_{i=1}^{3} {|u|}_i^2}
    where  u_i = x_i + i*y_i and   {|u|}_i is the usual modulus of a complex number
    Just apply to your u-bar
    That again that is just a guess. I don't think that we should have to guess.

    Here is a point. If this is about functions of "several complex variables" then it is a slope question.
    Because |\overline{~u~}|=|u|, what is the point?
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  5. #5
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    Re: Help me

    Quote Originally Posted by Plato View Post
    What sort of object is u=(1,-2i,3+i)~? Are those complex numbers?

    What operation is involved with |\overline{u}|~?
    I read OP as a complex number problem and u is a vector. If i is a unit vector on the x-axis, the first component is 1 and one of the two other components must be either the unit vector j and k.

    I read the components as (1 + 0i), (0 - 2i), (3 + 1i).

    The moduli are: 1, 2, sqrt(10).
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    Re: Help me

    Quote Originally Posted by votan View Post
    I read OP as a complex number problem and u is a vector. If i is a unit vector on the x-axis, the first component is 1 and one of the two other components must be either the unit vector j and k.
    I read the components as (1 + 0i), (0 - 2i), (3 + 1i).
    The moduli are: 1, 2, sqrt(10).
    But you are guessing. Why should we have to guess?
    We must expect poster to give a minimal amount of information as well as show some effort.
    If a poster show some of his/her work, then we have some basis on which to make a reasonable guess.
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  7. #7
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    Re: Help me

    Here's where I got my point from:

    http://www.dms.umontreal.ca/~gauthier/6140.pdf

    Just saying. Don't need to reply to my post.
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  8. #8
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    Re: Help me

    Plato's point is that there is an ambiguity in the OP's question. His point is well taken...at first blush what the OP is asking is obvious, but as | \overline{u} | = | u | the problem makes no sense to ask. So questioning the OP is a natural step that needs to be taken. Continuing to make guesses at what soso123 was trying to ask is simply a waste of time and effort.

    I'd say wait until soso123 comes back to clear this up. If (s)he doesn't then the problem gets dropped.

    -Dan
    Last edited by topsquark; September 25th 2013 at 05:18 AM.
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