It was found in previous observational studies that the quasi-biennial oscillation (QBO) can modulate teleconnection over Atlantic basin related to Madden–Julian Oscillation (MJO). In t...

In this article, we classify connected commutative (locally) Nash groups, which is a continuation of our previous work on the classification abelian manifolds. Our results generalize one-dimensional case by Madden-Stanton and two-dimensional Baro-Vicente-Otero. Moreover, determine affineness toroidal group.