On tight projective designs |
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| Authors: | Yu. I. Lyubich |
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| Affiliation: | (1) Department of Mathematics, Technion, Haifa, 32000, Israel |
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| Abstract: | It is shown that among all tight designs in  , where  is  or  , or  (quaternions), only 5-designs in  (Lyubich, Shatalora Geom Dedicata 86: 169–178, 2001) 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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| Keywords: | Projective design Angle set Bose-Mesner algebra |
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