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Subquadrangles of order s of generalized quadrangles of order (s, s(2)), part III

机译:阶(s,s(2))的广义四边形的s的子四边形,第三部分

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In this paper, we investigate subquadrangles, of order s of flock generalized quadrangles S of order (s(2), s), s odd, with base point (infinity), where the subquadrangle does not contain the point (infinity). We prove that if the flock generalized quadrangle has such a subquadrangle, then S is classical. This solves "Remaining case (a)" in Brown and Thas [M.R. Brown, J.A. Thas, Subquadrangles of order s of generalized quadrangles of order (s, s(2)), II, J. Combin. Theory Ser. A 106 (2004) 33-48] ("Remaining case (b)" was already handled in K. Thas [K. Thas, Symmetrieen in eindige veralgemeende vierhoeken (Symmetries in finite generalized quadrangles), Master thesis, Ghent University, Ghent, 1999, 186 p.]). As a corollary we have: if O(n, 2n, q) is an egg in PG(4n - 1, q) for which the translation dual O*(n, 2n, q) is good at the tangent space of O(n, 2n, q) at its element pi and if there is a pseudo-oval on O(n, 2n, q) not containing,7, then O(n, 2n, q) is classical. As a byproduct we prove that if the flock GQ S of order (s2, s), s odd, has a regular point x collinear with, but distinct from, the base point (infinity), then S is a translation generalized quadrangle with base line x(infinity). (c) 2006 Elsevier Inc. All rights reserved.
机译:在本文中,我们研究了次四角形,其次为群(s(2),s),s奇数的群广义四边形S的s,基点为(无穷大),其中该四角形不包含点(无穷大)。我们证明如果群广义四边形具有这样的子四边形,则S是经典的。这解决了Brown和Thas的“剩余案例(a)” [M.R。布朗J.A. Thas,阶(s,s(2))的广义四边形s的子四边形,II,J。Combin。理论系列A 106(2004)33-48](“剩余案例(b)”已在K. Thas [K. Thas,eindige veralgemeende vierhoeken中的Symmetrieen(有限广义四边形中的Symmetries)中进行了处理),硕士学位论文,根特大学,根特, 1999,186 p。])。作为推论,我们有:如果O(n,2n,q)是PG(4n-1,q)中的一个鸡蛋,则其对偶O *(n,2n,q)的平移空间在O( n,2n,q)在元素pi处,如果O(n,2n,q)上存在不包含7的伪椭圆,则O(n,2n,q)是经典的。作为副产品,我们证明如果数量为(s2,s),s为奇数的羊群GQ S的正点x与基点(无穷大)共线,但又与基点(无穷大)共线,则S是具有基数的平移广义四边形第x(无限)行。 (c)2006 Elsevier Inc.保留所有权利。

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