By A.D. Alexandrov, N.S. Dairbekov, S.S. Kutateladze, A.B. Sossinsky

ISBN-10: 3540231587

ISBN-13: 9783540231585

Convex Polyhedra belongs to the classics in geometry. There easily isn't any different booklet that offers with some of the points of the idea of three-dimensional convex polyhedra in a similar means, and in anyplace close to its aspect and completeness. it's a definitive resource of the classical box of convex polyhedra and comprises the to be had solutions to the query of the information which can uniquely verify a convex polyhedron. this question issues all information pertinent to a polyhedron, e.g. the lengths of edges, components of faces, etc.

This very important and obviously written publication contains the fundamentals of convex polyhedra and collects the main common life theorems for convex polyhedra which are proved through a brand new and unified approach. it's a awesome resource of rules for college kids.

The English variation comprises a variety of reviews in addition to extra fabric and a complete bibliography through V.A. Zalgaller to deliver the paintings brand new. additionally, comparable papers via L.A.Shor and Yu.A.Volkov were additional as vitamins to this e-book.

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**Example text**

3 The spherical image of an unbounded polyhedron. A closed convex polyhedron has support planes of all possible directions. Hence, its spherical image covers the entire sphere and has area 4π. An unbounded convex polyhedron always contains a half-line. Therefore, given a support plane Q to the polyhedron, we can ﬁnd a support plane of this half-line which is parallel to Q, by shifting Q inside the polyhedron until Q begins to touch the half-line. Consequently, the spherical image of our unbounded polyhedron lies inside the spherical image of the half-line.

Whenever we talk about some limit angle, these cases are not excluded in advance. If an unbounded polygon undergoes the inﬁnite similarity contraction to some point O, then in the limit it transforms obviously into its limit angle (Fig. 21). Therefore, under an inﬁnite similarity contraction of an unbounded polyhedron P with respect to a point, its unbounded faces transform into their limit angles and the polyhedron itself transforms into its limit angle. Consequently, the limit angle may also be deﬁned as the result of an inﬁnite similarity contraction of the polyhedron.

Prove the following generalization of Theorems 5 and 6: The convex hull of a ﬁnite collection of points Ai and half-lines aj starting at some of the points inward the interior of the same half-space is a convex solid polyhedron. Its limit angle is the convex hull of the collection of the half-lines aj starting at a single point. Its vertices are among the points Ai . Further, one of the points is a vertex if and only if it does not belong to the convex hull of the collection of the other points and the half-lines aj .

### Convex Polyhedra by A.D. Alexandrov, N.S. Dairbekov, S.S. Kutateladze, A.B. Sossinsky

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