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Salvetti complexes for conditional oriented matroids

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arxiv 2507.06365 v1 pith:SCQYH42G submitted 2025-07-08 math.CO

Salvetti complexes for conditional oriented matroids

classification math.CO
keywords orientedconditionalmatroidsproofsalvettiarrangementassociatedchoices
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We give a new proof of the fact that the complement of the complexification of a real hyperplane arrangement is homotopy equivalent to the Salvetti complex of the associated oriented matroid. Our proof involves no choices, is relatively easy to visualize, and generalizes to the setting of conditional oriented matroids.

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