deck transformation group造句

If " X " is a deck transformation group on " X " is properly discontinuous as well as being free.
The deck transformations are multiplications with " n "-th roots of unity and the deck transformation group is therefore isomorphic to the cyclic group " C " " n ".
Every free, properly discontinuous action of a group " G " on a path-connected topological space " X " arises in this manner : the quotient map is a regular covering map, and the deck transformation group is the given action of " G " on " X ".
It's difficult to find deck transformation group in a sentence. 用deck transformation group造句挺难的