* this class should not be used for this
* context.
*
+ * This class allows to query the
+ * value, gradient and divergence of
+ * (components of) shape functions
+ * and solutions representing
+ * vectors. The
+ * gradient of a vector
+ * $d_{k}, 0\le k<\text{dim}$ is
+ * defined as
+ * $S_{ij} = \frac{\partial d_{i}}{\partial x_j},
+ * 0\le i,j<\text{dim}$.
+ *
* You get an object of this type if you
* apply a FEValuesExtractors::Vector to an
* FEValues, FEFaceValues or
* <code>dim</code> components of the
* finite element, the gradient is a
* <code>Tensor@<2,spacedim@></code>.
+ *
+ * See the general documentation of this class for how exactly
+ * the gradient of a vector is defined.
*/
typedef dealii::Tensor<2,spacedim> gradient_type;
* function and quadrature point
* selected by the arguments.
*
+ * See the general documentation of this class for how exactly
+ * the gradient of a vector is defined.
+ *
* @note The meaning of the arguments
* is as documented for the value()
* function.