I have removed deprecated geometry tag in two questions that were bumped today. If you have some suggestions for some other tags suitable there, I will be grateful.
A side note - I was hesitant to edit it since I am not a native speaker - is quadrupel an English word? Should it be quadruplet?
Given 4 points $A$, $B$, $C$ and $D$ in general position in the euclidean plane, is it possible to determine from the 6 distances $AB$, $BC$, $CD$, $AD$, $AC$ and, $BD$ alone, whether every point is a corner of their convex hull under the restriction that comparing sums and/or differences of the ...
White has proved (White, G. K. Lattice tetrahedra -- Canad. J. Math. 16 1964 389–396.) the following theorem:
If $T$ is a closed tetrahedron and $\Lambda$ is a lattice which contains the vertices of $T$, then the two following conditions are equivalent:
(1) The only points of $\Lambda$ in $T$ ...
White has proved (White, G. K. Lattice tetrahedra -- Canad. J. Math. 16 1964 389–396.) the following theorem:
If $T$ is a closed tetrahedron and $\Lambda$ is a lattice which contains the vertices of $T$, then the two following conditions are equivalent:
(1) The only points of $\Lambda$ in $T$ ...
