message: Wrapping math formulae in \f$
diff: @@ -1175,8 +1175,8 @@ public:
  /** @brief Matrix coefficient defined as -a k x k x, for a vector k and scalar a
  - This coefficient returns a * (|k|^2 I - k \otimes k), where I is
  - the identity matrix and \otimes indicates the outer product. This
  + This coefficient returns \f$a * (|k|^2 I - k \otimes k)\f$, where I is
  + the identity matrix and \f$\otimes\f$ indicates the outer product. This
  can be evaluated for vectors of any dimension but in three
  dimensions it corresponds to computing the cross product with k twice.
  */
  