A Locally Polar Geometry Associated With the Group HS
نویسندگان
چکیده
منابع مشابه
HS 0943 + 1404 , a true intermediate polar ⋆
We have identified a new intermediate polar, HS 0943+1404, as part of our ongoing search for cataclysmic variables in the Hamburg Quasar Survey. The orbital and white dwarf spin periods determined from time-resolved photometry and spectroscopy are P orb ≃ 250 min and Pspin = 69.171 ± 0.001 min, respectively. The combination of a large ratio Pspin/P orb ≃ 0.3 and a long orbital period is very un...
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A lattice 9 is locally polar if each element is a join of points (atoms) and each interval L?$ = (y j x < y}, x a point, is a polar space (see Tits [6] or Buekenhout and Shult [4]). Recall that the rank of a polar space is the maximum projective dimension of an element; since this number is finite, 9 has a 1 and a 0. There is an obvious dimension function on 9, so lines and planes have the obvi...
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The study of geometries on the absolute points of polarities in projective spaces has been started by Veldkamp [21], who was the first to give a synthetic characterization of these geometries, which he called polar spaces. As part of his work on spherical buildings [19], Tits extended Veldkamp’s results to a somewhat larger class of geometries related to pseudo-quadratic forms. In 1974, Buekenh...
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ژورنال
عنوان ژورنال: European Journal of Combinatorics
سال: 1990
ISSN: 0195-6698
DOI: 10.1016/s0195-6698(13)80059-5