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


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

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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 '14 at 10:17

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



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


enter image description here

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\mathbf{K}_{i} is the correct syntax. – egreg Apr 2 '14 at 10:26
@egreg Thanks. I, too, think that the OP wanted to write that. – karlkoeller Apr 2 '14 at 10:29

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