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\begin{equation}

E-\epsilon_{i}-T_{i}-V_{0,i}(\textbf{R}) \tilde \chi_{i}^(+)(\textbf{K_{i}},\textbf{R})&=0


\end{equation}

Missing $ inserted and I don't know why. Can anybody help me? thanks

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1  
Don't leave blank lines in math mode; LaTeX tries to interpret them as paragraph breaks, which aren't allowed in math mode. –  ChrisS Apr 2 at 10:17
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1 Answer 1

There are some issues in your equation:

  1. The & character inside equation is not allowed (it is used for alignment in other math environments).
  2. You can not leave blank lines inside an equation.
  3. When you say \textbf{K_{i}} you are entering text mode and the _ character is not allowed.
  4. Also I think that in \textbf{K_{i}} you don't want the subscript to be bold.
  5. If you want (+) to be a superscript you have to encase it in braces.

So, if you want bold letters in upright mode, substitute \textbf with \mathbf

\documentclass{article}

\begin{document}

\begin{equation}
E-\epsilon_{i}-T_{i}-V_{0,i}(\mathbf{R}) \tilde \chi_{i}^{(+)}(\mathbf{K}_{i},\mathbf{R})=0
\end{equation}

\end{document} 

enter image description here

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2  
\mathbf{K}_{i} is the correct syntax. –  egreg Apr 2 at 10:26
    
@egreg Thanks. I, too, think that the OP wanted to write that. –  karlkoeller Apr 2 at 10:29
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