User:R2Z2

R2Z2, what a strange pseudonym which obviously reminds of a droid from a science fiction hexalogy but which does not have it roots in it.

Actually, this user name comes from the mathematical notation $$\mathbb{R}^2/\mathbb{Z}^2$$ refering by definition to the set $$ \{ \{ (x,y) \in \mathbb{R}^2 / x \equiv a[1]~et~y \equiv b[1] \} / (a,b) \in \mathbb{R}^2 \}$$ which happens to have the topology of a torus surface.

R2Z2 (Fr)