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Decomposition into pairs-of-pants for complex algebraic hypersurfaces
Authors:Grigory Mikhalkin
Institution:a Department of Mathematics, University of Utah, Salt Lake City, UT 84112, USA
b St. Petersburg Branch, Steklov Mathematical Institute, Fontanka 27, St. Petersburg, 191011, Russia
Abstract:It is well-known that a Riemann surface can be decomposed into the so-called pairs-of-pants. Each pair-of-pants is diffeomorphic to a Riemann sphere minus 3 points. We show that a smooth complex projective hypersurface of arbitrary dimension admits a similar decomposition. The n-dimensional pair-of-pants is diffeomorphic to View the MathML source minus n+2 hyperplanes.Alternatively, these decompositions can be treated as certain fibrations on the hypersurfaces. We show that there exists a singular fibration on the hypersurface with an n-dimensional polyhedral complex as its base and a real n-torus as its fiber. The base accommodates the geometric genus of a hypersurface V. Its homotopy type is a wedge of hn,o(V) spheres Sn.
Keywords:14J70
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