On tight projective designs

Details On tight projective designs On tight projective designs

2007-03-18

arxiv.org/abs/math/0703526v1

Mathematics

Combinatorics

10 pages, no figures

Scientific paper

It is shown that among all tight designs in FP^n, where F is R, C, or H
(quaternions), other than RP^1, only 5-designs in CP^1 have irrational angle
set. This is the only case of equal ranks of the first and the last irreducible
idempotent in the corresponding Bose-Mesner algebra.

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