Math & Science ⇒ equation error

[wadoud]

hi all
i have the following error:

Code: Select all

! Extra }, or forgotten \right.

thank you

Code: Select all

\begin{align}
\Phi &= \frac{\partial V_{i}}{\partial x_{j}}  \tau_{ij}\\
&= \mu \left[ 2 \left( \frac{\partial V_{x}}{\partial x}\right)^{2} +2\left( \frac{\partial V_{y}}{\partial x}\right)^{2} +2\left( \frac{ \partial V_{z}}{ \partial x}\right)^{2} +\left( \frac{ \partial V_{x}}{ \partial x} +\frac{\partial V_{x}}{\partial y}\right)^{2}\\ 
&+   \left(\frac{\partial V_{z}}{\partial y} +\frac{\partial V_{y}}{ \partial z}\right)^{2} + \left( \frac{\partial V_{x}}{ \partial z} +\frac{\partial V_{z}}{ \partial x}\right)^{2} \left]    + \lambda \left(\frac{ \partial V_{x}}{\partial x} +\frac{ \partial V_{y}}{\partial y} +\frac{ \partial V_{z}}{ \partial z} \right)^{2}     
\label{eq:mmm}
\end{align}

[Stefan Kottwitz]

There are unmatched square brackets: \left[ and \left]. Remove them or make them to a correct \left \right pair.

Stefan

[wadoud]

thank you stefan