多面体

For a small cover over a polytope, its equivariant cobordism class is determined by the tangential representation set.

摘体上的小覆盖的等变配边是它的切表示集所决定的。

In this paper the relationship between the crystal forms and the growth mechanism of quartz and tinstone under the hydrothermal solution conditions has been studied.

本文研究了热液条件下，水晶和锡石的结晶态和生长机制的关系，提出了水晶和锡石的生长基元为配位负离子体结构。