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Orbits on the projective line |
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| Authors: | D.C van Leijenhorst |
| Affiliation: | Mathematisch Instituut, Katholieke Universiteit, Toernooiveld, 6525 ED Nijmegen, The Netherlands |
| Abstract: | Let PGL(2, q) act in the natural way on the four-sets and the five-sets in PG(1, q). We determine the number of orbits of any given size and use this to construct some 3-designs on q + 2 points. |
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