
The present article provides a new characterization of the geometry on the points and hyperbolic lines of a non-degenerate symplectic polar space. This characterization is accomplished by studying the family of subspaces obtained when considering the polars of all hyperbolic lines. Let \(\mathbb W_{2n-1}(\mathbb F)\) denote the polar space with respect to a non-degenerate symplectic polarity of \(\mathbb P_{2n-1}(\mathbb F)\), for \(n\geqslant1\) and \(\mathbb F\) a field. The hyperbolic line graph \(\mathbf S(\mathbb W_{2n-1}(\mathbb F)) =\mathbf S_{2n-1}(\mathbb F)\) then is the graph on the hyperbolic lines of \(\mathbb W_{2n-1}(\mathbb F)\) where hyperbolic lines \(l\) and \(m\) are adjacent (in symbols \(l\bot m\)) iff all points of \(l\) are collinear (in \(\mathbb W_{2n-1}(\mathbb F)\)) to all points of \(m\). Let \(n\geqslant4\), and let \(\Gamma\) be a connected graph that is locally \(\mathbf S(\mathbb W_{2n-1}(\mathbb F))\). Then \(\Gamma\) is isomorphic to \(\mathbf S_{2n+1}(\mathbb F)\). A perp space is a partial linear space \((\mathcal P,\mathcal L)\) endowed with a symmetric relation \(\bot\subseteq\mathcal P\times\mathcal P\) such that for every point \(x\), whenever \(p\neq q\) are points on a line \(l\), the fact \(x\bot p\) and \(x\bot q\) implies \(x\bot y\) for all \(y\in l\). Let \(n\geqslant4\), and let \((\mathcal P,\mathcal L,\bot)\) be a perp space in which for any line \(k\in\mathcal L\) the space \(k^\bot\) is isomorphic to the hyperbolic symplectic geometry of \(\mathbb W_{2n-1}(\mathbb F)\) with \(l\bot m\) iff \(m\) is in the polar of \(l\) for (hyperbolic) lines \(l\), \(m\) inside \(k^\bot\). If the graph \((\mathcal L,\bot)\) is connected, then \((\mathcal P,\mathcal L,\bot)\) is isomorphic to the hyperbolic symplectic geometry \(\mathbb W_{2n+1}(\mathbb F)\).
hyperbolic symplectic geometry, locally hyperbolic line graphs, points and hyperbolic lines, perp spaces, long root subgroup of symplectic group, Hyperbolic and elliptic geometries (general) and generalizations, Theoretical Computer Science, Computational Theory and Mathematics, symplectic polarity, locally homogeneous graphs, Discrete Mathematics and Combinatorics, symplectic polar space
hyperbolic symplectic geometry, locally hyperbolic line graphs, points and hyperbolic lines, perp spaces, long root subgroup of symplectic group, Hyperbolic and elliptic geometries (general) and generalizations, Theoretical Computer Science, Computational Theory and Mathematics, symplectic polarity, locally homogeneous graphs, Discrete Mathematics and Combinatorics, symplectic polar space
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