Correct typo (math rendering)

diff --git a/include/deal.II/fe/fe_interface_values.h b/include/deal.II/fe/fe_interface_values.h
index 0a61e5f9f3ce949127cd402fcccfa1372c13012b..17b1813c82a547a0a653689032afddc08e0dc924 100644 (file)
--- a/include/deal.II/fe/fe_interface_values.h
+++ b/include/deal.II/fe/fe_interface_values.h
@@ -871,7 +871,7 @@ namespace FEInterfaceViews
     //@{
 
     /**
-     * Return the average vector $\average{\mathbf{u}}=\frac{1}{2}(\matbf{u_1} +
+     * Return the average vector $\average{\mathbf{u}}=\frac{1}{2}(\mathbf{u_1} +
      * \mathbf{u_2})$ on the interface for the shape
      * function @p interface_dof_index in the quadrature point @p q_point.
      */