books.google.com - Often questions about tiling space or a polygon lead to questions concerning algebra. For instance, tiling by cubes raises questions about finite abelian groups. Tiling by triangles of equal areas soon involves Sperner's lemma from topology and valuations from algebra. The first six chapters of Algebra...http://books.google.com/books/about/Algebra_and_Tiling.html?id=QOa-mnX5Y4QC&utm_source=gb-gplus-shareAlgebra and Tiling