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On Menelaus' and Ceva's theorems in Nil geometry

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arxiv 2110.08877 v1 pith:O4CNY3KR submitted 2021-10-17 math.MG

classification math.MG
keywords geodesicgeometrycevamenelaussurfacetriangleapolloniuscite
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abstract

In this paper we deal with $\NIL$ geometry, which is one of the homogeneous Thurston 3-geometries. We define the "surface of a geodesic triangle" using generalized Apollonius surfaces. Moreover, we show that the "lines" on the surface of a geodesic triangle can be defined by the famous Menelaus' condition and prove that Ceva's theorem for geodesic triangles is true in $\NIL$ space. In our work we will use the projective model of $\NIL$ geometry described by E. Moln\'ar in \cite{M97}.

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  1. Menelaus' and Ceva's theorems for translation triangles in Thurston geometries

    math.GT 2025-06 reject novelty 5.0 of 10

    Menelaus' and Ceva's theorems are formulated and proved for translation triangles in Nil, Sol, and ~SL2R spaces using geometry-specific simple ratios.

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