A. Cohen

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math.CO2020

A Sylvester-Gallai result for concurrent lines in the complex plane

Alex Cohen

We show that if a set of points in $C^{2}$ lies on a family of $m$ concurrent lines, and if one of those lines contains more than $m - 2$ points, then there is a line passing…

math.CO2019

Sinkhorn limits in finitely many steps

Alex Cohen, Melvyn B. Nathanson

Applied to a nonnegative $m \times n$ matrix with a nonzero $σ$ -diagonal, the sequence of matrices constructed by alternate row and column scaling conveges to a doubly stochastic ma…