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

砷族物是一族六方类质同象列物，包砷、钒和磷氯。

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.

复平面C中，任意有界域拓扑边界上连续函数代数K_1-群与其边界上上同伦群同构。