* hyperball and the like. Following is a list of domains that can be generated
* by the functions of this class:
* <ul>
+ * <li> Hypercube:
+ * the GridGenerator::hyper_cube function produces the unit line
+ * segment, unit square, or unit cube:
+ *
+ * @image html hyper_cubes.png
+ *
* <li> Generalized L-shape domain:
* using the GridGenerator::hyper_L (tria, a,b) function produces
* the hypercube with the interval $[a,b]$ without the hypercube
* made out of the interval $[(a+b)/2,b]$. Let, for example, be $a=-1$
* and $b=1$, then the hpyer-L in two dimensions is the region
* $[-1,1]^2 - [0,1]^2$. To create a hyper-L in one dimension results in
- * an error. The function is also implemented for three space dimensions.
+ * an error. The function is also implemented for three space dimensions
+ * and produces the following domain (not completely to scale, the
+ * cut-out part should have exactly half the edge length of the entire
+ * cube):
+ *
+ * @image html hyper_l.png
*
* <li> Hyper ball:
* You get the circle or ball (or generalized: hyperball) around