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

摘要多面体上小覆盖等变配边类是由它切表示集所决定。

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，水锡石长机制关系，提出了水锡石长基元为配位负离子多面体构。