Estimation of the visibility angle of a curve in a metric space of nonpositive curvature.
Reshetnyak, Yu.G. (2002)
Sibirskij Matematicheskij Zhurnal
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Reshetnyak, Yu.G. (2002)
Sibirskij Matematicheskij Zhurnal
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Sharafutdinov, V.A. (2002)
Sibirskij Matematicheskij Zhurnal
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Fei Xu, Jianqiang Zhao (1996)
Acta Arithmetica
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Barbara Glanc, Antoni Jakubowicz (2000)
Applicationes Mathematicae
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The Weyl curvature tensor for the generalized Reissner-Nordstrοm space-time is determined and theorems related to the Penrose conjecture are proved.
Harald Niederreiter, Chaoping Xing (1998)
Acta Arithmetica
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Hog-Angeloni, Cynthia, Metzler, Wolfgang (2006)
Sibirskie Ehlektronnye Matematicheskie Izvestiya [electronic only]
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Ekholm, Tobias (2006)
Algebraic & Geometric Topology
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Harald Niederreiter, Arne Winterhof (2000)
Acta Arithmetica
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Tronin, S.N. (2002)
Sibirskij Matematicheskij Zhurnal
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Frits Beukers, Don Zagier (1997)
Acta Arithmetica
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Radan Kučera (1994)
Acta Arithmetica
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There are many different definitions of the group of circular units of a real abelian field. The aim of this paper is to study their relations in the special case of a compositum k of real quadratic fields such that -1 is not a square in the genus field K of k in the narrow sense. The reason why fields of this type are considered is as follows. In such a field it is possible to define a group C of units (slightly bigger than Sinnott's group of circular units) such...