Changes
| <math>\delta_D(Z)</math> or <math>d^{out}_D(Z)</math> || Number of arcs of directed (hyper)graph ''D'' with at least one tail in ''Z'' and at least one head outside of ''Z''
|-
| ''<math>x(Z)'' </math> || For <math>x \in {\mathbb R}^V</math> and <math>Z \subseteq V</math>: sum of ''x(v)'' over all <math>v \in Z</math>
|-
| <math>\chi^Z</math> || For <math>Z \subseteq V</math>: incidence vector of ''Z'' in <math>{\mathbb R}^V</math>
