Changes
| <math>d_G(Z)</math> || Number of edges in (hyper)graph ''G'' with at least one endpoint in ''Z'' and at least one endpoint outside of ''Z''
|-
| <math>d_x(Z)</math> || For (hyper)graph ''G=(V,E)'' and <math>x \in {\mathbb R}^E</math>: sum of ''<math>x(e)'' </math> on edges with at least one endpoint in ''Z'' and at least one endpoint outside of ''Z''
|-
| <math>i_G(Z)</math> || Number of edges in (hyper)graph ''G'' induced by ''Z''
| <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 ''<math>x(v)'' </math> 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>
