[Tex/LaTex] How to turn off equation auto numbering

equationsnumbering

I have an equation like this:

   \begin{align}
      P(A \cup B) = \sum_{\omega \in A \cup B} P(\omega) = \sum_{\omega \in A} P(\omega) + \sum_{\omega \in B} P(\omega)
      = P(A) + P(B)
    \end{align}

For some reason, LaTeX is automatically labeling the equation. How do I turn that off? Secondly how do I write something in LaTeX on this site. I tried enclosing in '$' but it doesn't work.

Best Answer

Do a \begin{align*} ... \end{align*}. That should do the trick.