Joel Friedman

activity

20102022

most citedThe Relativized Second Eigenvalue Conjecture of Alon

17 citations · 18 across the 3 of their papers we have counts for

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2 papers · 1 filter

math.CO2022

Euler Characteristics and Duality in Riemann Functions and the Graph Riemann-Roch Rank

Nicolas Folinsbee, Joel Friedman

By a {\em Riemann function} we mean a function $f : Z^{n} \to Z$ such that $f (d) = f (d_{1}, \dots, d_{n})$ is equals $0$ for $deg (d) = d_{1} + \dots + d_{n}$ s…

math.CO2010★ 1 cited

The Strengthened Hanna Neumann Conjecture I: A Combinatorial Proof

Joel Friedman

We prove the Strengthened Hanna Neumann Conjecture, in its common graph theoretic formulation. Our original approach to this conjecture used cohomology of sheaves on graphs, althou…