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Latex Alignment Problem

  1. Jul 22, 2007 #1
    Hi guys, I want to write up some math and have the following code:

    \begin{align}
    L_{A}(s)&=V(A,0)-V(A,s) \\
    &=\int_{t=A}^{T(A)+A-\alpha S_{A}}e^{-r(t-A)}W_{t}dt - \int_{t=A}^{T(A)+A-\alpha (S_{A}+s)}e^{-r(t-A)}W_{t}dt \\
    &=\int^{T(A)+A-\alpha S_{A}}_{T(A)+A-\alpha(S_{A}+s)}e^{-r(t-A)W_{t}dt}
    \end{align}

    Now using Physics Forum's inbuilt Latex thingy the following appears:

    [tex]
    \begin{align*}
    L_{A}(s)&=V(A,0)-V(A,s) \\
    &=\int_{t=A}^{T(A)+A-\alpha S_{A}}e^{-r(t-A)}W_{t}dt - \int_{t=A}^{T(A)+A-\alpha (S_{A}+s)}e^{-r(t-A)}W_{t}dt \\
    &=\int^{T(A)+A-\alpha S_{A}}_{T(A)+A-\alpha(S_{A}+s)}e^{-r(t-A)W_{t}dt}
    \end{align*}
    [/tex]

    However, when I try to compile this using my own Latex compiler, I get the following error message:

    [​IMG]

    It says that the "align" doesn't work! Are there any computer experts who know what I am doing wrong??
     
  2. jcsd
  3. Jul 22, 2007 #2
    The "align" environment is provided by the AMS-LaTeX package and can be activated by including the line
    Code (Text):
    \usepackage{amsmath}
    somewhere in the preamble of your document. I believe the LaTeX functionality of Physics Forums enables AMS-LaTeX by default, which is why the "align" environment is working correctly on Physics Forums but is not working in your document.
     
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