The classification of SPG-systems of index 2. (English) Zbl 1044.51005

The structure of a \(SPG\)-system in a polar space was introduced and investigated by J. A. Thas in [Adv. Geom. 1, 229–244 (2001; Zbl 0985.51006)]. In the paper under review the author studies new cases both in singular and in nonsingular polar spaces.


51E14 Finite partial geometries (general), nets, partial spreads
51A50 Polar geometry, symplectic spaces, orthogonal spaces


Zbl 0985.51006
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