多面体

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

摘要多面体上的小覆盖的等变配边类是由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.

本文研液条件下，锡石的结态生长机制的关系，提出锡石的生长基元为配位负离子多面体结构。