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Let $P$ be a polyhedron.
$P$ is a convex polyhedron if and only if:
- For all points $A$ and $B$ located inside $P$, the line $AB$ is also inside $P$.
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Entry: polyhedron (polyhedra)