<div id="comment:0"></div> Part of #32651. Outsource initialization and very basic access (Vrepresentation, Hrepresentation, backend, base_ring) to a base class `Polyhedron_base0`. Depends on #32637 CC: @kliem @jplab @tscrim @mkoeppe Component: **geometry** Author: **Jonathan Kliem** Branch/Commit: **[`078cc56`](https://github.com/sagemath/sagetrac-mirror/commit/078cc56af53928090a86d4dbd00633565a3b4676)** Reviewer: **Matthias Koeppe** _Issue created by migration from https://trac.sagemath.org/ticket/32767_