Hankel Transform of the Second Form (q,r)-Dowling Numbers

In this paper, using the rational generating for the second form of the q-analogue of r-Whitney numbers of the second kind, certain divisibility property for this form is established. Moreover, the Hankel transform for the second form of the q-analogue of r-Dowling numbers is derived.

A magnetic modular form

In this paper, we prove a conjecture of Broadhurst and Zudilin concerning a divisibility property of the Fourier coefficients of a meromorphic modular form using the generalization of the Shimura lift by Borcherds and Hecke operators on vector-valued modular forms developed by Bruinier and Stein. Furthermore, we construct a family of meromorphic modular forms with this property.

Generalizing the Divisibility Property of Rectangle Domino Tilings

We introduce a class of graphs called compound graphs, which are constructed out of copies of a planar bipartite base graph, and explore the number of perfect matchings of compound graphs. The main result is that the number of matchings of every compound graph is divisible by the number of matchings of its base graph. Our approach is to use Kasteleyn's theorem to prove a key lemma, from which the divisibility theorem follows combinatorially. This theorem is then applied to provide a proof of Problem 21 of Propp's Enumeration of Matchings, a divisibility property of rectangles. Finally, we present a new proof, in the same spirit, of Ciucu's factorization theorem.

Proof of a Conjecture of Amdeberhan and Moll on a Divisibility Property of Binomial Coefficients

Let $a,b$ and $n$ be positive integers with $a>b$. In this note, we prove that $$(2bn+1)(2bn+3){2bn \choose bn}\bigg|3(a-b)(3a-b){2an \choose an}{an\choose bn}.$$ This confirms a recent conjecture of Amdeberhan and Moll.

Bing doubling and the colored Jones polynomial

Bing doubling is a satellite operation on links which replaces a knot component with a 2-component link in a certain way. In this paper we give a formula for the reduced colored Jones polynomial of a Bing double in terms of that of the companion. Using this formula we derive a divisibility property of the unified Witten–Reshetikhin–Turaev invariant of integral homology spheres obtained by ±1-surgery along Bing doubles of knots. This result is applied to the Witten–Reshetikhin–Turaev invariant and the Ohtsuki series of these integral homology spheres.