Displaying similar documents to “Realizing automorphisms of the fundamental group of irreducible 3-manifolds containing two-sided projective planes.”

Central Automorphisms of Veblenian Nearaffine Planes

Kinga Cudna-Lasecka, Jan Jakóbowski (2005)

Bulletin of the Polish Academy of Sciences. Mathematics

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The paper deals with nearaffine planes described by H. A. Wilbrink. We consider their central automorphisms, i.e. automorphisms satisfying the Veblen condition, which become central collineations in connected projective planes. Moreover, a concept of central pseudo-automorphism is considered, i.e. some bijections in a nearaffine plane are not automorphisms but they become central collineations in the related projective planes.

The Double Tangency Symmetries in Laguerre Plane

Jarosław Kosiorek, Andrzej Matraś (2007)

Bulletin of the Polish Academy of Sciences. Mathematics

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The group generated by double tangency symmetries in a Laguerre plane is investigated. The geometric classification of involutions of a symmetric Laguerre plane is given. We introduce the notion of projective automorphisms using the double tangency and parallel perspectivities. We give the description of the groups of projective automorphisms and automorphisms generated by double tangency symmetries as subgroups of the group M(𝔽,ℝ) of automorphisms of a chain geometry Σ(𝔽,ℝ) following...