Polyhedra (Cubes, Pyramids etc): Does these solids consist of the boundary points only, or do they include interior points ?
I'm confused whether a general polyhedron (solid object: cube, pyramid etc.) include the boundary points of the surface only or if they include the interior points also ?
Pictures of these solid objects always show half transparent sides and "nothing" on the inside. Also reading about the sphere (http://en.wikipedia.org/wiki/Sphere), this object does not include the interior points, but only the points of radius $r$ from the origin.
Could someone clarify the definition of a solid object in $n$-dimensional space ? Wikipedia use the term without explanation. - and tell me whether objects like those already written down (also cylinder etc.) include boundary points (points on the "outside") only ?