Séminaire Lotharingien de Combinatoire, 82B.60 (2019), 12 pp.
Marcelo Aguiar, Jose Bastidas, and Swapneel Mahajan
Characteristic elements for real hyperplane arrangements
Abstract.
Characteristic elements of the Tits algebra of a real hyperplane arrangement carry information about the characteristic polynomial. We present this notion and its basic properties, and apply it to derive various results about the characteristic polynomial of an arrangement, from Zaslavsky's formulas to more recent results of Kung and of Klivans and Swartz. We construct several examples of characteristic elements, including one in terms of intrinsic volumes of faces of the arrangement.
Received: November 15, 2018.
Accepted: February 17, 2019.
Final version: April 1, 2019.
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