# Hyperrectangle

Hyperrectangle
Orthotope

A rectangular cuboid is a 3-orthotope
Type Prism
Facets 2n
Vertices 2n
Schläfli symbol {} × {} ... × {}[1]
Coxeter-Dynkin diagram ...
Symmetry group [2n−1], order 2n
Dual Rectangular n-fusil
Properties convex, zonohedron, isogonal

In geometry, an orthotope[2] (also called a hyperrectangle or a box) is the generalization of a rectangle to higher dimensions. It is formally defined as the Cartesian product of orthogonal intervals.

## Types

A three-dimensional orthotope is also called a right rectangular prism, rectangular cuboid, or rectangular parallelepiped.

The special case of an n-dimensional orthotope where all edges have equal length is the n-cube.[2]

By analogy, the term "hyperrectangle" or "box" can refer to Cartesian products of orthogonal intervals of other kinds, such as ranges of keys in database theory or ranges of integers, rather than real numbers.[3]

## Dual polytope

n-fusil

Example: 3-fusil
Facets 2n
Vertices 2n
Schläfli symbol {} + {} + ... + {}
Coxeter-Dynkin diagram ...
Symmetry group [2n−1], order 2n
Dual n-orthotope
Properties convex, isotopal

The dual polytope of an n-orthotope has been variously called a rectangular n-orthoplex, rhombic n-fusil, or n-lozenge. It is constructed by 2n points located in the center of the orthotope rectangular faces.

An n-fusil's Schläfli symbol can be represented by a sum of n orthogonal line segments: { } + { } + ... + { }.

A 1-fusil is a line segment. A 2-fusil is a rhombus. Its plane cross selections in all pairs of axes are rhombi.

n Example image
1
{ }
2
{ } + { }
3
Rhombic 3-orthoplex inside 3-orthotope
{ } + { } + { }

## Notes

1. ^ N.W. Johnson: Geometries and Transformations, (2018) ISBN 978-1-107-10340-5 Chapter 11: Finite symmetry groups, 11.5 Spherical Coxeter groups, p.251
2. ^ a b Coxeter, 1973
3. ^ See e.g. Zhang, Yi; Munagala, Kamesh; Yang, Jun (2011), "Storing matrices on disk: Theory and practice revisited" (PDF), Proc. VLDB, 4 (11): 1075–1086.

## References

This page was last updated at 2021-06-05 14:51, View original page

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