Definition 3.66 . [02MG]

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Definition 3.66.

Let $\Lambda$ be a polyhedron and $K$ a face of $\Lambda$ . The angle of $\Lambda$ at $K$ is defined as

\angle(K,\Lambda)=\{t(u-v)\mid u\in\Lambda,v\in K,t\geq 0\}.

It is a polyhedral cone.