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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