# How to solve “Missing delimiter (. inserted) \end{eqnarray*}”? [duplicate]

This question is an exact duplicate of:

How can I solve this problem?

I have so many similar to this problem.

## marked as duplicate by Henri Menke, Stefan Pinnow, Martin Schröder, Zarko, Torbjørn T.Jun 22 '17 at 7:42

This question was marked as an exact duplicate of an existing question.

• isn't this identical to the question you just asked? You need \right. (your image shows no . after \right) but please do not show an image of your source code, post the actual text. – David Carlisle Jun 21 '17 at 22:16
• Welcome to TeX.SX! Please help us help you and add a minimal working example (MWE) that illustrates your problem. Reproducing the problem and finding out what the issue is will be much easier when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – Martin Schröder Jun 22 '17 at 7:30

You just need to add . after \right even if there is nothing to show in the typeset. This informs TeX engine that the brackets now ended. Check this code for example:

P_{e, \thinspace WT} = \left \{ % \begin{aligned} % & 0 & & v_{w} \thinspace < \thinspace v_{ci} \\ & P_{GCR} (v_{w}) \quad & v_{ci} \thinspace \leq \thinspace & v_{w} \thinspace \leq v_{r} \\ & P_{r, \thinspace WT} & v_{r} \thinspace \leq \thinspace & v_{w} \thinspace \leq v_{co} \\ & 0 & & v_{w} > \thinspace v_{co} % \end{aligned} % \right % \label{eq:WTPSC}


Without the dot after \right, you will get a similar error to that shown above. Use the following code (the same as above but with \right.):

P_{e, \thinspace WT} = \left \{ % \begin{aligned} % & 0 & & v_{w} \thinspace < \thinspace v_{ci} \\ & P_{GCR} (v_{w}) \quad & v_{ci} \thinspace \leq \thinspace & v_{w} \thinspace \leq v_{r} \\ & P_{r, \thinspace WT} & v_{r} \thinspace \leq \thinspace & v_{w} \thinspace \leq v_{co} \\ & 0 & & v_{w} > \thinspace v_{co} % \end{aligned} % \right. % \label{eq:WTPSC}


You will get:

Which means after finishing all of the cases close the set of equations, but not with another curly bracket - simply close it with the "nothing" bracket!