Let แป be an ovoid of PG(3 , q ) , q even , such that each secant plane section is an oval contained in a translation hyperoval . Then แป is shown to be either an elliptic quadric or a Tits ovoid .
Ovoids and monomial ovals
โ Scribed by David G. Glynn; Christine M. O'Keefe; Tim Penttila; Cheryl E. Praeger
- Publisher
- Springer
- Year
- 1996
- Tongue
- English
- Weight
- 904 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0046-5755
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โฆ Synopsis
This paper is a contribution to the classification of ovoids. We show, under some rather technical assumptions, that if an ovoid of PG(3, q) has a pencil of monomial ovals, then it is either an elliptic quadric or a Tits ovoid. Further, we show that if an ovoid of PG(3, q) has a bundle of translation ovals, again under some extra assumptions, then the ovoid is an elliptic quadric or a Tits ovoid.
๐ SIMILAR VOLUMES
Let F be a flock of the quadratic cone Q: X 2 2 =X 1 X 3 , in PG(3, q), q even, and let 6 t : X 0 = x t X 1 + t 1ร2 X 2 + z t X 3 , t # F q , be the q planes defining the flock F. A flock is equivalent to a herd of ovals in PG(2, q), q even, and to a flock generalized quadrangle of order (q 2 , q).
In PG (3, q), q even, Cherowitzo made a detailed study of flocks of a cone with a translation oval as base; also called -flocks . To a flock of a quadratic cone in PG(3, q), q even, there always corresponds a set of q#1 ovals in PG(2, q), called an oval herd. To an -flock of a cone with an arbitrary
An infinite family of q-clans, called the Subiaco q-clans, is constructed for q = 2 ~. Associated with these q-clans are flocks of quadratic cones, elation generalized quadrangles of order (q2, q), ovals of PG(2, q) and translation planes of order q2 with kernel GF(q). It is also shown that a q-clan