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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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)
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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...