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Torus link homology

We compute the triply graded Khovanov-Rozansky homology of a family of links, including positive torus links and $Sym^l$-colored torus knots.

Five-term relation and Macdonald polynomials

The non-commutative five-term relation $T\_{1,0} T\_{0,1}=T\_{0,1} T\_{1,1} T\_{1,0}$ is shown to hold for certain operators acting on symmetric functions. The "generalized recursion" conjecture of Bergeron and Haiman is a corollary of this result. …

Integrality of Hausel–Letellier–Villegas kernels

We prove that the coefficients of the generating function of Hausel, Letellier, and Rodriguez-Villegas and its recent generalization by Carlsson and Rodriguez-Villegas, which according to various conjectures should compute mixed Hodge numbers of …

A proof of the shuffle conjecture

We present a proof of the compositional shuffle conjecture by Haglund, Morse and Zabrocki [Canad. J. Math., 64 (2012), 822-844], which generalizes the famous shuffle conjecture for the character of the diagonal coinvariant algebra by Haglund, …

Homology of torus knots

Using the method of Elias-Hogancamp and combinatorics of toric braids we give an explicit formula for the triply graded Khovanov-Rozansky homology of an arbitrary torus knot, thereby proving some of the conjectures of Aganagic-Shakirov, Cherednik, …

Plethystic identities and mixed Hodge structures of character varieties

I demonstrate how certain identities for Macdonald's polynomials established by Garsia, Haiman and Tesler, together with the conjecture of Hausel, Letellier and Villegas imply explicit relations between mixed Hodge polynomials of different character …

Toric braids and $(m, n) $-parking functions

The Dyck path algebra construction of Carlsson and Mellit from arXiv:1508.06239 is interpreted as a representation of "the positive part" of the group of toric braids. Then certain sums over $(m,n)$-parking functions are related to evaluations of …

Finite hypergeometric functions

We show that values of finite hypergeometric functions defined over Q correspond to point counting results on explicit varieties defined over finite fields.

Dwork's congruences for the constant terms of powers of a Laurent polynomial

In this paper, we prove that the constant terms of powers of a Laurent polynomial satisfy certain congruences modulo prime powers. As a corollary, the generating series of these numbers considered as a function of a p-adic variable admits an analytic …

Derived categories of Keum's fake projective planes

We conjecture that derived categories of coherent sheaves on fake projective $n$-spaces have a semi-orthogonal decomposition into a collection of exceptional objects and a category with vanishing Hochschild homology. We prove this for fake projective …