Assertion: polyhedron's edge | /r/CapableOf | join precisely 2 faces
Facets:
Source sentences:
text: Intuitively, I'm guessing that all “sensible” polyhedra – with simple faces (or at least faces with simply-connected edges) and each edge joining precisely 2 faces – have duals, with the caveat that the polar reciprocal duals of non-convex polyhedra may be self-intersecting.