Differentiable manifold with a transitive nilpotent group of diffeomorphisms; homogeneous space of the form N/H, where N is a nilpotent Lie group and H a closed subgroup
glata sternaĵo kun transitiva nulpotenca grupo da difeomorfioj; homogena spaco de formo N/H, en kiu N estas nulpotenca Lie-grupo kaj H estas fermita subgrupo (eo)
differentiable manifold with a transitive nilpotent group of diffeomorphisms; homogeneous space of the form N/H, where N is a nilpotent Lie group and H a closed subgroup (en)