Let A be an n-by-n matrix of real numbers which are weakly decreasing down each column, Z_n = diag(z_1,..., z_n) a diagonal matrix of indeterminates, and J_n the n-by-n matrix of all ones. We prove that per(J_nZ_n+A) is stable in the z_i, resolving a recent conjecture of Haglund and Visontai. This immediately implies that per(zJ_n+A) is a polynomial in z with only real roots, an open conjecture of Haglund, Ono, and Wagner from 1999. Other applications include a multivariate stable Eulerian polynomial, a new proof of Grace's apolarity theorem and new permanental inequalities.
CITATION STYLE
Brändén, P., Haglund, J., Visontai, M., & Wagner, D. G. (2011). Proof of the Monotone Column Permanent Conjecture. In Notions of Positivity and the Geometry of Polynomials (pp. 63–78). Springer Basel. https://doi.org/10.1007/978-3-0348-0142-3_5
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