Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Basis of a real vector space with complex vectors

  1. Sep 29, 2008 #1
    1. The problem statement, all variables and given/known data

    Find a basis for [tex]V=\mathbb{C}^1[/tex], where the field is the real numbers.

    3. The attempt at a solution

    I'd say [tex]\vec{e}_1=(1,0), \vec{e}_2=(i,0)[/tex] is a basis, because it seems to me that [tex] \vec{u}=a+bi \in V[/tex] can be written as

    [tex]a(1,0)+b(i,0)=(a,0)+(bi,0)=\mathbf{(a+bi,0)=a+bi+0=a+bi=\vec{u} }[/tex], where a and b are real.

    I'm a bit unsure about the bolded part, though. Is it correct?
     
    Last edited: Sep 29, 2008
  2. jcsd
  3. Sep 29, 2008 #2
    Ok, I have no idea why the tex code isn't doing its job.

    Fixed.
     
    Last edited: Sep 29, 2008
  4. Sep 29, 2008 #3

    HallsofIvy

    User Avatar
    Science Advisor

    tex looks good to me. Since you are doing this over the real numbers, yes, (1, 0) and (i, 0) work fine although I would see no reason to write the "0" and don't think you really need to write this as a pair. "1" and "i" as basis should do.
     
  5. Sep 30, 2008 #4
    Yeah, I fixed the code.

    Thanks for your help!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook