// In the constructor of this class, we first store the value that was
// passed in concerning the degree of the finite elements we shall use (a
// degree of zero, for example, means to use RT(0) and DG(0)), and then
- // construct the vector valued element belonging to the space X_h described
+ // construct the vector valued element belonging to the space $X_h$ described
// in the introduction. The rest of the constructor is as in the early
// tutorial programs.
//
// end, we first have to make sure that the indices corresponding to
// velocities and pressures are not intermingled: First all velocity
// degrees of freedom, then all pressure DoFs. This way, the global matrix
- // separates nicely into a 2x2 system. To achieve this, we have to
+ // separates nicely into a $2 \times 2$ system. To achieve this, we have to
// renumber degrees of freedom base on their vector component, an
// operation that conveniently is already implemented:
DoFRenumbering::component_wise (dof_handler);
// maximal number of nonzero entries per row (this could be done more
// efficiently in this case, but we only want to solve relatively small
// problems for which this is not so important). In the second step, we
- // allocate a 2x2 block pattern and then reinitialize each of the blocks
+ // allocate a $2 \times 2$ block pattern and then reinitialize each of the blocks
// to its correct size using the <code>n_u</code> and <code>n_p</code>
// variables defined above that hold the number of velocity and pressure
// variables. In this second step, we only operate on the individual
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