string group
topological group, not presentable as a finite-dimensional Lie group, but presentable as a Frechet Lie group, obtained by killing the third homotopy group of the spin group
en-GB/ˈstɹɪŋ ˈɡɹuːp/
en-US/ˈstɹɪŋ ˈɡɹup/
topological group, not presentable as a finite-dimensional Lie group, but presentable as a Frechet Lie group, obtained by killing the third homotopy group of the spin group