Abstract
The Hard Lefschetz theorem is known to hold for the intersection cohomology of the toric variety associated to a rational convex polytope. One can construct the intersection cohomology combinatorially from the polytope, hence it is well defined even for nonrational polytopes when there is no variety associated to it. We prove the Hard Lefschetz theorem for the intersection cohomology of a general polytope.
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Barthel, G., Brasselet, J.-P., Fieseler, K.-H., Kaup, L.: Combinatorial Intersection cohomology for Fans. Tôhoku Math. J. 54, 1–41 (2002)
Billera, L.J., Lee, C.W.: Sufficiency of McMullen’s conditions for f-vectors of simplicial polytopes. Bull. Am. Math. Soc., New Ser. 2, 181–185 (1980)
Bressler, P., Lunts, V.A.: Intersection cohomology on nonrational polytopes. Compos. Math. 135, 245–278 (2003)
Brion, M.: The Structure of the Polytope Algebra. Tôhoku Math. J. 49, 1–32 (1997)
Fieseler, K.-H.: Rational Intersection Cohomology of Projective Toric Varieties. J. Reine Angew. Math. 413, 88–98 (1991)
Griffiths, P., Harris, J.: Principles of Algebraic Geometry. John Wiley & Sons, Inc. 1978
McMullen, P.: The numbers of faces of simplicial polytopes. Isr. J. Math. 9, 559–570 (1971)
McMullen, P.: On Simple Polytopes. Invent. Math. 113, 419–444 (1993)
Stanley, R.: The number of faces of a simplicial convex polytope. Adv. Math. 35, 236–238 (1980)
Stanley, R.: Generalized h-vectors, intersection cohomology of toric varieties and related results. In: Commutative Algebra and Combinatorics, ed by. M. Nagata, H. Matsumura, Adv. Stud. Pure Math. 11, pp. 187–213. Tokyo: Kinokunia and Amsterdam, New York: North Holland 1987
Timorin, V.: On polytopes simple in edges. (Russian) Funkts. Anal. Prilozh. 35, 36–47 (2001), 95; translation in Funct. Anal. Appl. 35, 189–198 (2001)
Timorin, V.: An analogue of the Hodge-Riemann relations for simple convex polytopes. Russ. Math. Surv. 54, 381–426 (1999)
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Karu, K. Hard Lefschetz theorem for nonrational polytopes. Invent. math. 157, 419–447 (2004). https://doi.org/10.1007/s00222-004-0358-3
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DOI: https://doi.org/10.1007/s00222-004-0358-3