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https://doi.org/10.1007/978-3-642-50071-8ts full automorphism group is .(..), but J. also acts flag-transitively on it. We shall prove that this geometry is indeed the unique flag-transitive c.U*-geometry, thus obtaining a new geometric characterization of the Hall-Janko group ...

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Photoelektrische Halbleiterbauelemente,geometry, gets a bit strange in infinite rank. Some precise description of the departure of these two concepts in infinite rank is given. Some speculations are offered about which “classical” infinite-rank geometries may still possess characterizations by point-line axioms.

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Histologische Struktur des Haarfollikelsurthermore, if the abstract transvections of Γ act as linear transvections on some finite-dimensional vector space over a commutative field of characteristic ≠ 2, we construct a weak embedding of Γ in a projective space, which is full over a subfield. This yields that Γ is a symplectic or a hermitia

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https://doi.org/10.1007/978-3-663-06840-2(.), but using some geometric properties of the hexagon and an involution. Remarking that a similar construction holds in certain quadrangles of order s, with . a power of 2, we obtain ovoids in quadrangles of type ..(.).

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