Crystallography has proven a rich source of ideas over several centuries.
Among the many ways of looking at space groups, N. David Mermin has pioneered
the Fourier-space approach. Recently, we have supplemented this approach with
methods borrowed from algebraic topology. We now show what topology, which
studies global properties of manifolds, has to do with crystallography. No
mathematics is assumed beyond what the typical physics or crystallography
student will have seen of group theory; in particular, the reader need not have
any prior exposure to topology or to cohomology of groups.Comment: 21 pages + figures, bibliography, Mathematica code homology.