Catalan Traffic and Integrals on the Grassmannians of Lines

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We prove that certain numbers occurring in a problem of paths enumeration, studied by Niederhausen (Catlan Traffic at the Beach, The Electronic Journal of Combinatorics, 9, (2002), 1--17), are top intersection numbers in the cohomology ring of the grassmannians of the lines in the complex projective (n+1)-space.
Excerpt from my Ph.D. Thesis; to appear on "Discrete Mathematics"

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Algebraic Geometry, 14M15;05C35

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http://salesiana.dossiersoluciones.com/handle/123456789/226978

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0704.2376
 http://arxiv.org/abs/0704.2376
 Discrete Mathematics, Volume 308, number 1, pp 148-152, 2008
 doi:10.1016/j.disc.2007.03.085

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arXiv