equationsline-breakingmath-mode
I'm having this error each time i try to build the file "Missing \right or extra } error". I tried to figure it out but I could not know in which part is the error. I need break line because without it it will be not aligned and at the margin space. I just start using latex so
help me please
\[
\begin{aligned}
\Omega = \left\{&(H, H, H), (H, H, T), (H, T, H), (H, T, T), (T, H, H), (T, H, T),\\
&(T, T, H), (T, T, T)\right\}
\end{aligned}
\]
If you enclose your text in \shortstack{...}, you'll get the line breaks:
\documentclass{article}
\usepackage{subfig}
\begin{document}
\begin{figure}[h]
\centering
\subfloat[a]{\shortstack{A\\\texttt{This is a test}}}
\subfloat[b]{B}
\end{figure}
\end{document}
The alignment can be adjusted using the optional argument. \shortstack[l]{...} will align your text on the left, \shortstack[r]{...} on the right.
Besides the balancing issue associated to the use of \left, \right, your expression can be improved introducing some modifications:
\left( ... \right) for the inner expressions produces delimiters that are too big and introduce some additional horizontal space that it's superfluous in this particular case, so I think that it's better to use just (...).+{} so that the ending plus sign in the first line is correctly trated as an operator; analogously, you need to use {}+ for the first plus sign in the second line.\left[, \right. in the first line and \right., \left] in the second line, I would suggest you to use \bigl[, \bigr] which don't need to be balanced in each line and produce better sized delimiters in most cases.In the following code I include, for comparison, your code (with the balancing problem solved) and then the code implementing my suggestions:
\documentclass[12pt]{article}
\usepackage[margin=2cm]{geometry}% just for the example
\usepackage{amsmath}
\begin{document}
\begin{equation}
\begin{split}
MSE_{II}(\overline{y}_{CST}) &= MSE_{I}(\overline{y}_{CST})
+\overline{Y}^{2}\left[ \left( c_{2}^{2}+2c_{1}c_{3} \right)V_{4,\, 0}+2c_{1}c_{2}V_{3,\,0}
+2\left(2c_{1}c_{2}+c_{3}\right)V_{3,\, 1} + \right. \\
& \left. + 2 \left(c_{1}^{2}+c_{2} \right)V_{2,\, 1}+ \left(c_{1}^{2}+2c_{2} \right)V_{2,\, 2}
+ {2c_{1}V_{1,\, 2}} \right]
\end{split}
\end{equation}
\begin{equation}
\begin{split}
MSE_{II} ( \overline{y}_{CST} ) &= MSE_{I} ( \overline{y}_{CST} )
+ \overline{Y}^{2} \bigl[ (c_{2}^{2} + 2c_{1}c_{3} ) V_{4,\, 0} + 2c_{1}c_{2} V_{3,\,0}
+ 2 ( 2c_{1}c_{2} + c_{3} ) V_{3,\, 1} +{} \\
&\qquad {}+ 2 ( c_{1}^{2} + c_{2} )V_{2,\, 1} + ( c_{1}^{2} + 2c_{2} ) V_{2,\, 2}
+ {2c_{1}V_{1,\, 2}} \bigr]
\end{split}
\end{equation}
\end{document}
Best Answer
an alignment or table cell marked with
&forms a TeX group, and you need the matching\leftto be in the same group as the opening\rightso
is an error as it is like
Just remove the
\leftand\rightin this instance, or in general replace them by\bigland\bigrwhere the fixed-size versions do not need to be in pairs within the same cell.