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We define specific multiplicities on the braid arrangement by using signed graphs. To consider their freeness, we introduce the notion of signed‐eliminable graphs as a generalization of Stanley's classification theory of free graphic arrangements by chordal graphs. This generalization gives us a complete classification of the free multiplicities defined above. As an application, we prove one direction of a conjecture of Athanasiadis on the characterization of the freeness of certain deformations of the braid arrangement in terms of directed graphs.

Signed‐eliminable graphs and free multiplicities on the braid arrangement