<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>In this paper we deal with <bold>Nil</bold> 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 trianglesistruein <bold>Nil</bold> space. In our work we will use the projective model of <bold>Nil</bold> geometry described by E. Molnár in [<xref ref-type="bibr" rid="j_ausm-2023-0008_ref_006">6</xref>].</p>
</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 trianglesistruein Nil space. In our work we will use the projective model of Nil geometry described by E. Molnár in [6].

On Menelaus’ and Ceva’s theorems in Nil geometry

Institute of Mathematics, Budapest University of Technology and Economics

Acta Universitatis Sapientiae, Mathematica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"On Menelaus\u2019 and Ceva\u2019s theorems in Nil geometry"}

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...

On Menelaus’ and Ceva’s theorems in Nil geometry

Publié en ligne: 15 nov. 2023

Pages: 123 - 141

Reçu: 11 juil. 2022

DOI: https://doi.org/10.2478/ausm-2023-0008

Mots clés
Thurston geometries, geometry, geodesic triangles, Menelaus’ and Ceva’s theorems

© 2023 Jenő Szirmai, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

On Menelaus’ and Ceva’s theorems in Nil geometry

Publié en ligne: 15 nov. 2023

Pages: 123 - 141

Reçu: 11 juil. 2022

DOI: https://doi.org/10.2478/ausm-2023-0008

Mots clésThurston geometries, geometry, geodesic triangles, Menelaus’ and Ceva’s theorems

© 2023 Jenő Szirmai, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
Thurston geometries, geometry, geodesic triangles, Menelaus’ and Ceva’s theorems