===== Sequence reversion =====
==== Function ====
| @#55CCEE: context     | @#55CCEE: $ X $ ... set |

| @#FFBB00: definiendum | @#FFBB00: $ \mathrm{rev}: \mathrm{FiniteSequence}(X)\to\mathrm{FiniteSequence}(X) $ |

| @#55EE55: postulate   | @#55EE55: $ \pi_n(\mathrm{length}(S))=\pi_{\mathrm{length}(S)+1-n}(S)$ |

==== Discussion ====
==== Parents ====
=== Subset of ===
[[Idempotent function]]
=== Context ===
[[Sequence length]]