Sheaves on Graphs, Their Homological Invariants, and a Proof of the Hanna Neumann Conjecture

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Sheaves on Graphs, Their Homological Invariants, and a Proof of the Hanna Neumann Conjecture is written by Joel Friedman and published by American Mathematical Soc.. It's available with International Standard Book Number or ISBN identification 1470409887 (ISBN 10) and 9781470409883 (ISBN 13).

In this paper the author establishes some foundations regarding sheaves of vector spaces on graphs and their invariants, such as homology groups and their limits. He then uses these ideas to prove the Hanna Neumann Conjecture of the 1950s; in fact, he proves a strengthened form of the conjecture.