讴歌 - Vansdaddy

In this paper we consider all these nonassociative algebras defined by the action of invariant subspaces of the symmetric group $Σ_3$ on the associator of the considered laws.

This is the final paper in a series of four, concerning the surface $T \times T$ embedded in $\mathbb{CP}^8$, where $T$ is a the one dimensional torus. In this paper we compute the fundamental group of the Galois cover of the surface with respect to a generic projection onto $\mathbb{CP}^2$, and show that it is nilpotent of class 3. This is the first time such a group is presented as the fundamental group of a Galois cover of a surface.

随着我国低碳环保理念的提出，城市发展建设中园林工程得到更多的重视。园林是城市的天然氧吧，通过绿化植物的合理搭配能够提高整体低碳、释氧水平，改善城市小气候。其中绿化植物发挥着关键性作用，园林土壤、绿化植物运输、栽植以及养护工作均会影响植物的成活率和景观效果。