===== Simple graph =====
==== Set ====
| @#55CCEE: context     | @#55CCEE: $V,E$ ... set |

| @#FFBB00: definiendum | @#FFBB00: $\langle V,E,\psi\rangle \in \mathrm{it}(E,V) $ |

| @#55EE55: postulate   | @#55EE55: $\langle V,E,\psi\rangle $ ... loopless graph |

| @#55EE55: postulate   | @#55EE55: $ \psi $ ... injective |

==== Discussion ====
Two vertices $\{u,v\}$ of a a simple graph are connected by at most one edge.
==== Parents ====
=== Subset of ===
[[Loopless graph]]