Relative symplectic subquadrangle hemisystems of the Hermitian surface |
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Authors: | Antonio Cossidente Giuseppe Marino Tim Penttila |
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Institution: | 1. Dipartimento di Matematica e Informatica, Università della Basilicata, 85100, Potenza, Italy 2. Dipartimento di Matematica, Seconda Università di Napoli, 81100, Caserta, Italy 3. Department of Mathematics, Colorado State University, Fort Collins, CO, 80523-1874, USA
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Abstract: | We introduce the notion of relative subquadrangle regular system of a generalized quadrangle. A relative subquadrangle regular system of order m on a generalized quadrangle S of order (s, t) is a set \({\mathcal R}\) of embedded subquadrangles with a prescribed intersection property with respect to a given subquadrangle T such that every point of S T lies on exactly m subquadrangles of \({\mathcal R}\) . If m is one half of the total number of such subquadrangles on a point we call \({\mathcal R}\) a relative subquadrangle hemisystem with respect to T. We construct two infinite families of symplectic relative subquadrangle hemisystems of the Hermitian surface \({{\mathcal H}(3,q^2)}\) , q even. |
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