One can check that is a functor from the category of rings to the category of groups : every ring homomorphism induces a group homomorphism, since maps units to units.
12.
Geologic map units are described and classified on the basis of morphology, texture, and albedo, and they are assigned relative ages based on stratigraphic relations and on visual comparisons of the density of superposed craters.
13.
Students of genetics employ the term synteny to describe the situation in which two genetic loci have been assigned to the same chromosome but still may be separated by a large enough distance in map units that genetic linkage has not been demonstrated.
14.
World In Conflict is an Real-time strategy modern war simulation where you can control vehicles, infantry, helicopters, and artillery ( as well as a number of off-map units such as longer range artillery and planes ( and the odd nuke ! ) ), but I don't know how it compares to Imperial Glory in terms of similarity.
15.
We're on our way back to the county's Emergency Operations Center, where Bird, a curator at the Smithsonian National Museum of American History, will scan the sidewalk demonstration for that perfect election sign _ the kind that will end up in an acid-free folder, tucked away in a map unit drawer inside the Washington, D . C . museum.
