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The (, )-hypersimplex is the convex hull of all 0 / 1-vectors of length  with coordinate sum . We explicitly determine the extension complexity of all hypersimplices as well as of certain classes of combinatorial hypersimplices. To that end, we investigate the projective realization spaces of hypersimplices and their (refined) rectangle covering numbers. Our proofs combine ideas from geometry and combinatorics and are partly computer assisted.

Extension Complexity and Realization Spaces of Hypersimplices