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math.MG2023
Translation-like isoptic surfaces and angle sums of translation triangles in $\NIL$ geometry
Géza Csima, Jenő Szirmai
After having investigated the geodesic and translation triangles and their angle sums in $\SOL$ and $\SLR$ geometries we consider the analogous problem in $\NIL$ space that is one…
math.MG2016
The sum of the interior angles in geodesic and translation triangles of Sl2(R) geometry
Géza Csima, Jenő Szirmai
We study the interior angle sums of translation and geodesic triangles in the universal cover of Sl2(R) geometry. We prove that the angle sum is larger then pi for translation tria…