Mimetite group minerals are a group of isomorphic series minerals with hexagonal system,which include mimetite,vanadinite and pyromorphite.

砷铅是一六方晶系的类质同象系列，包砷铅、钒铅和磷氯铅。

Further more,we prove that the cohomotopy groups is isomorphic to K1 -group of the continuous algebra on topological boundary of bounded domains in C.

在复平面C中，任有域的拓扑边上连续函数代数的K_1-群与其边上的上同伦群同构。