We assume $\mathbb{K} = \mathbb{R}$. Deduce from question 14 that $O _ { 2,1 }$ is the union of four closed subsets pairwise disjoint and path-connected.
We assume $\mathbb{K} = \mathbb{R}$. Deduce from question 14 that $O _ { 2,1 }$ is the union of four closed subsets pairwise disjoint and path-connected.