fix latex formula

diff --git a/include/deal.II/lac/matrix_lib.h b/include/deal.II/lac/matrix_lib.h
index 2c2a3e14bf0c4d8c9b9601c9745b29810fd1e02d..5bb75c3fd9262915cf96db5a7f7d8df4f9435957 100644 (file)
--- a/include/deal.II/lac/matrix_lib.h
+++ b/include/deal.II/lac/matrix_lib.h
@@ -312,7 +312,7 @@ private:
  * a vector $\mathbf v$ and $\frac 1n {\mathbf 1}_n$ yields the <i>mean
  * value</i> of the entries of ${\mathbf v}$. Consequently, $ \left[I-\frac
  * 1n{\mathbf 1}_n{\mathbf 1}_n^T\right] \mathbf v = \mathbf v - \left[\frac
- * 1n \mathbf v} \cdot {\mathbf 1}_n\right]{\mathbf 1}_n$ subtracts from every
+ * 1n {\mathbf v} \cdot {\mathbf 1}_n\right]{\mathbf 1}_n$ subtracts from every
  * vector element the mean value of all elements.
  *
  * @author Guido Kanschat, 2002, 2003