Is there a quadrangle $Q \subset \Bbb CP^2$, namely $Q$ is a set of four points, such that every permutation of $Q$ can be realizable by an isometric projectivity of $\Bbb CP^2$?
Very symmetric quadrangle in $\Bbb CP^2$
Daniele Zuddas
- 2.3k
- 13
- 19