Abstract
Strong Jordan systems are certain subspaces of associative algebras closed under inversion and with many units. Every strong Jordan system gives rise to a chain space. We show that every homotopism of Jordan systems yields a morphism between the associated chain spaces and vice versa. By this, we obtain an isomorphy of categories.
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References
C.G. Bartolone, Jordan homomorphisms, chain geometries and the fundamental theorem. Abh. Math. Sem. Hamburg59 (1989), 93–99.
W. Benz, Vorlesungen über Geometrie der Algebren. Springer, Berlin, 1973.
A. Blunck, Chain geometries over local alternative algebras, J. Geom.44 (1992), 33–14.
A. Herzer, On isomorphisms of chain geometries, Note di Mat.8 (1987), 251–270.
A. Herzer, Die Kategorie der Kettengeometrien, Res. Math.12 (1987), 278–288.
A. Herzer, On sets of subspaces closed under reguli, Geom. Dedicata41 (1992), 89–99.
A. Herzer, Chain Geometries, in: Handbook of Incidence Geometry, ed. F. Buekenhout, North-Holland, Amsterdam, to appear.
A. Herzer, Private communication.
N. Jacobson, Structure and Representations of Jordan Algebras, AMS Coll. Publ.39, Providence, 1968.
H.-J. Kroll, Unterräume von Kettengeometrien und Kettengeometrien mit Quadrikenmodell, Res. Math.19 (1991), 327–334.
H. Mäurer, R. Metz andW. Nolte, Die Automorphismengruppe der Möbiusgeometrie einer Körpererweiterung, Aequationes Math.21 (1980), 110–112.
G. Pickert, Projektive Ebenen, Springer, Berlin, 1955.
K. Sörensen, Der Fundamentalsatz für Projektionen, Mitt. Math. Ges. Hamburg11 (1985), 303–309.
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Blunck, A. Chain spaces over Jordan systems. Abh.Math.Semin.Univ.Hambg. 64, 33–49 (1994). https://doi.org/10.1007/BF02940773
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DOI: https://doi.org/10.1007/BF02940773