books.google.fr - This book introduces the important ideas of algebraic topology emphasizing the relation of these ideas with other areas of mathematics. Rather than choosing one point of view of modern topology (homotropy theory, axiomatic homology, or differential topology, say) the author concentrates on concrete problems...http://books.google.fr/books/about/Algebraic_topology.html?hl=fr&id=4khJg2wSxeMC&q=boundary&utm_source=gb-gplus-shareAlgebraic topology
