[Tex/LaTex] equation in math mode

math-mode

\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

Best Answer

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

Related Question