===== 2-regular graph =====
==== Set ====
| @#55CCEE: context     | @#55CCEE: $V,E$ ... set |

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

| @#AAFFAA: inclusion   | @#AAFFAA: $ \langle V,E,\psi\rangle $ ... undirected graph |

| @#FFFDDD: for all     | @#FFFDDD: $ v\in V $ |

| @#55EE55: postulate   | @#55EE55: $ d(v)=2 $ |

==== Discussion ====
A finite 2-regular graph consists disconnected cycles.

A general 2-regular graph consists disconnected cycles or infinite chains.
==== Parents ====
=== Subset of ===
[[Regular graph]]
=== Refinement of ===
[[k-regular graph]]