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We show that the Zagier-Eisenstein series shares its non-holomorphic part with certain weak Maass forms whose holomorphic parts are generating functions for overpartition rank differences. This has a number of consequences, including exact…

Number Theory · Mathematics 2007-12-06 Kathrin Bringmann , Jeremy Lovejoy

We look at extensions of formulas given by Jovovic and recently proved by Dhar on integer partitions where the smallest part occurs at least $m$ times and on integer partitions with fixed differences between the largest and smallest parts…

Combinatorics · Mathematics 2024-01-08 Pankaj Jyoti Mahanta , Manjil P. Saikia

We consider $(k,j)$-colored partitions, partitions in which $k$ colors exist but at most $j$ colors may be chosen per size of part. In particular these generalize overpartitions. Advancing previous work, we find new congruences, including…

Combinatorics · Mathematics 2020-01-24 William J. Keith

Andrews introduced the partition function $\overline{C}_{k, i}(n)$, called singular overpartition, which counts the number of overpartitions of $n$ in which no part is divisible by $k$ and only parts $\equiv \pm i\pmod{k}$ may be overlined.…

Number Theory · Mathematics 2023-03-10 Chiranjit Ray

We use an injection method to prove a new class of partition inequalities involving certain $q$-products with two to four finitization parameters. Our new theorems are a substantial generalization of work by Andrews and of previous work by…

Combinatorics · Mathematics 2013-11-22 Alexander Berkovich , Keith Grizzell

Let $\overline{p}(n)$ denote the overpartition function. Liu and Zhang showed that $\overline{p}(a) \overline{p}(b)>\overline{p}(a+b)$ for all integers $a,b>1$ by using an analytic result of Engle. We offer in this paper a combinatorial…

Combinatorics · Mathematics 2022-07-01 Xixi Li

In his classic text, \emph{Combinatory Analysis}, MacMahon defined a perfect partition of a positive integer $n$ as a partition whose parts contain exactly one partition of every positive integer not exceeding $n$. In this paper we apply…

Combinatorics · Mathematics 2025-10-21 Augustine O. Munagi

Motivated by Alladi's recent multi-dimensional generalization of Sylvester's classical identity, we provide a simple combinatorial proof of an overpartition analogue, which contains extra parameters tracking the numbers of overlined parts…

Combinatorics · Mathematics 2018-04-06 Shane Chern , Shishuo Fu , Dazhao Tang

Bessenrodt and Ono, Chen, Wang and Jia, DeSalvo and Pak were the first to discover the log-subadditivity, log-concavity, and the third-order Tur\'{a}n inequality of partition function, respectively. Many other important partition statistics…

Number Theory · Mathematics 2023-08-10 Yi Peng , Helen W. J. Zhang , Ying Zhong

In this article, we introduce the notion of almost consecutive partitions. A partition is almost consecutive if every term is consecutive, with the possible exception of the smallest one. We find formulas relating to the smallest parts of…

Combinatorics · Mathematics 2024-03-26 Rajat Gupta , Noah Lebowitz-Lockard

Andrews introduced the partition function $\overline{C}_{k, i}(n)$, called singular overpartition, which counts the number of overpartitions of $n$ in which no part is divisible by $k$ and only parts $\equiv \pm i\pmod{k}$ may be overlined.…

Number Theory · Mathematics 2019-06-13 Rupam Barman , Chiranjit Ray

We extend recent results by G. E. Andrews and G. Simay on the $m$th largest and $m$th smallest parts of a partition to the more general context of skew plane partitions. In order to do this, we introduce new objects called skew plane…

Number Theory · Mathematics 2016-09-19 Robson da Silva , Almir Neto , Kelvin Souza

Recently, Andrews and Newman studied the minimal excludant of a partition, which is defined as the smallest positive integer that is not a part of a partition. In this article, we consider the minimal excludant size of an overpartition,…

Combinatorics · Mathematics 2024-11-07 Thomas Y. He , C. S. Huang , H. X. Li , X. Zhang

In this paper we give a full description of the inequalities that can occur between overpartition ranks. If $ \overline{N}(a,c,n) $ denotes the number of overpartitions of $ n $ with rank congruent to $ a $ modulo $ c,$ we prove that for…

Number Theory · Mathematics 2020-11-06 Alexandru Ciolan

We give combinatorial interpretations of two residual cranks of overpartitions defined by Bringmann, Lovejoy and Osburn in 2009 analogous to the crank of partitions given by Andrews and the first author in 1988. As a consequence, we give…

Combinatorics · Mathematics 2024-10-29 Frank G. Garvan , Rishabh Sarma

In 2019, Andrews investigated integer partitions in which all parts of a given parity are smaller than those of the opposite parity and introduced eight partition functions based on the parity of the smaller parts and parts of a given…

Combinatorics · Mathematics 2025-12-01 Yan Fan , Ernest X. W. Xia

Andrews and El Bachraoui recently studied various two-colored integer partitions, including those related to two-colored partitions into distinct parts with constraints and overpartitions. Their work raised questions about the existence of…

Combinatorics · Mathematics 2025-09-17 Dandan Chen , Jiahao Liu

In a recent paper, Thejitha and Fathima introduced the overcolored partition function $\bar{a}_{r,s}(n)$, which enumerates overpartitions in which even parts may appear in one of $r$ colors and odd parts in one of $s$ colors, for fixed…

Number Theory · Mathematics 2026-03-16 Imdadul Hussain , Suparno Ghoshal , Arijit Jana

Let $\bar{p}(n)$ denote the overpartition function. In this paper, we study the asymptotic higher order $\log$-concavity property of the overpatition function in a similar framework done by Hou and Zhang for the partition function. This…

Number Theory · Mathematics 2022-04-19 Gargi Mukherjee , Helen W. J. Zhang , Ying Zhong

Noting a curious link between Andrews' even-odd crank and the Stanley rank, we adopt a combinatorial approach building on the map of conjugation and continue the study of integer partitions with parts separated by parity. Our motivation is…

Number Theory · Mathematics 2025-06-11 Shishuo Fu , Dazhao Tang