Growing Spines: Ad Infinitum et Ad Infinitesimalia

Blaise Boissonneau, Anna De Mase, Franziska Jahnke +1

We prove that for every ordered abelian group $G$ there exists a non-trivial ordered abelian group $H$ such that $G\preccurlyeq H\oplus G$ with the lexicographic order, and give a…