Regular two distance sets

This paper makes a deep study of regular two-distance sets. A set of unit vectors \(X\) in Euclidean space \(\RR^n\) is said to be regular two-distance set if the inner product of any pair of its vectors is either \(\alpha\) or \(\beta\), and the number of \(\alpha\) (and hence \(\beta\)) on each ro...

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Bibliographic Details
Published in:arXiv.org 2019-10
Main Authors: Casazza, Peter G, Tran, Tin T, Tremain, Janet C
Format: Article
Language:English
Subjects:
Euclidean geometry
Euclidean space
Frames
Mathematical analysis
Vectors (mathematics)
Online Access:Get full text
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Summary:This paper makes a deep study of regular two-distance sets. A set of unit vectors \(X\) in Euclidean space \(\RR^n\) is said to be regular two-distance set if the inner product of any pair of its vectors is either \(\alpha\) or \(\beta\), and the number of \(\alpha\) (and hence \(\beta\)) on each row of the Gram matrix of \(X\) are the same. We present various properties of these sets as well as focus on the case where they form tight frames for the underling space. We then give some constructions of regular two-distance sets, in particular, two-distance frames, both tight and non-tight cases. Connections among two-distance sets, equiangular lines and quasi-symmetric designs are also given.
ISSN:2331-8422