On the group .
Fajziev, Valerij (2000)
ELA. The Electronic Journal of Linear Algebra [electronic only]
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Fajziev, Valerij (2000)
ELA. The Electronic Journal of Linear Algebra [electronic only]
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G. Miller (1902)
Prace Matematyczno-Fizyczne
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Emilio Bujalance (1981)
Revista Matemática Hispanoamericana
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By a non-Euclidean crystallographic (N.E.C.) group we shall mean a discrete subgroup Γ of isometries of the non-Euclidean plane including those reverse orientation, reflections and glide-reflections. In [1] we computed the proper periods of normal N.E.C. subgroups of an N.E.C. group, when the index of the group with respect to the subgroup is odd. In this paper we shall compute the proper period of normal N.E.C. subgroups, when the index is even. The corresponding...
Lozano-Robledo, Álvaro (2005)
Revista Colombiana de Matemáticas
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Ali Reza Ashrafi, Wu Jie Shi (2005)
Mathematica Slovaca
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John Stallings (1975-1976)
Séminaire Bourbaki
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Gang Xiao (1996)
Annales de l'institut Fourier
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We give a classification of finite group actions on a surface giving rise to quotients, from the point of view of their fixed points. It is shown that except two cases, each such group gives rise to a unique type of fixed point set.
Ján Duplák (1976)
Mathematica Slovaca
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