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We state and prove various new identities involving the Z_K parafermion characters (or level-K string functions) for the cases K=4, K=8, and K=16. These identities fall into three classes: identities in the first class are generalizations…

High Energy Physics - Theory · Physics 2010-11-01 Philip C. Argyres , Keith R. Dienes , S. -H. Henry Tye

We give simple proofs of Hecke-Rogers indefinite binary theta series identities for the two Ramanujan fifth order mock theta functions $\chi_0(q)$ and $\chi_1(q)$ and all three of Ramanujan's seventh order mock theta functions. We find that…

Number Theory · Mathematics 2019-07-11 Frank Garvan

Ramanujan presented four identities for third order mock theta functions in his Lost Notebook. In 2005, with the aid of complex analysis, Yesilyurt first proved these four identities. Recently, Andrews et al. provided different proofs by…

Combinatorics · Mathematics 2018-12-04 Su-Ping Cui , Nancy S. S. Gu , Chen-Yang Su

Recently, Nath and Das investigated congruence properties for the second order mock theta function $B(q)$. In their paper, they asked for analytic proofs of three identities on the second order mock theta functions $A(q)$, $B(q)$ and…

Number Theory · Mathematics 2026-01-06 Xingyuan Cai , Eric H. Liu , Olivia X. M. Yao

The famous Rogers-Ramanujan and Andrews--Gordon identities are embedded in a doubly-infinite family of Rogers-Ramanujan-type identities labelled by positive integers m and n. For fixed m and n the product side corresponds to a specialised…

Combinatorics · Mathematics 2013-11-06 S. Ole Warnaar

Andrews and the third author recently studied congruences for certain restricted two-color partitions. They made two conjectures for Ramanujan-type congruences and a vanishing identity for the limiting sequence. In this paper, we settle…

Number Theory · Mathematics 2026-04-03 Koustav Banerjee , Kathrin Bringmann , Mohamed El Bachraoui

We study Lusztig's t-analog of weight multiplicities associated to level one representations of twisted affine Kac-Moody algebras. An explicit closed form expression is obtained for the corresponding t-string function using constant term…

Representation Theory · Mathematics 2012-02-02 Sachin S. Sharma , Sankaran Viswanath

Ramanujan studied the analytic properties of many $q$-hypergeometric series. Of those, mock theta functions have been particularly intriguing, and by work of Zwegers, we now know how these curious $q$-series fit into the theory of…

Number Theory · Mathematics 2011-09-30 Kathrin Bringmann , Amanda Folsom , Robert C. Rhoades

We study higher rank Jacobi partial and false theta functions (generalizations of the classical partial and false theta functions) associated to positive definite rational lattices. In particular, we focus our attention on certain Kostant's…

Quantum Algebra · Mathematics 2019-02-19 Thomas Creutzig , Antun Milas

Recently, Andrews, Dixit and Yee introduced partition functions associated with Ramanujan/Watson third order mock theta functions $\omega(q)$ and $\nu(q)$. In this paper, we find several new exact generating functions for those partition…

Number Theory · Mathematics 2023-01-30 Nayandeep Deka Baruah , Nilufar Mana Begum

In this paper, we develop a unified method for obtaining and proving $m$-dissections of mock theta functions. Our approach builds upon a transformation formula for Appell--Lerch sums due to Hickerson and Mortenson, which allows these sums…

Number Theory · Mathematics 2026-03-27 Frank Garvan , Hemjyoti Nath

We present q-series proofs of four identities involving sixth order mock theta functions from Ramanujan's lost notebook. We also show how Ramanujan's identities can be used to give a quick proof of four sixth order identities of Berndt and…

Number Theory · Mathematics 2009-11-16 Jeremy Lovejoy

Motivated by the works of Liu, we provide a unified approach to find Appell-Lerch series and Hecke-type series representations for mock theta functions. We establish a number of parameterized identities with two parameters $a$ and $b$.…

Number Theory · Mathematics 2019-08-26 Dandan Chen , Liuquan Wang

In the paper, we give partition-theoretic results for the coefficients of some mock theta functions and prove their congruence properties. Some recurrence relations connecting the coefficients of the mock theta functions with certain…

Number Theory · Mathematics 2024-02-28 Sabi Biswas , Nipen Saikia

In this short note, a companion of [20], we discuss several families of $q$-series identities in connection to false and mock theta functions, characters of modules of vertex algebras, and "sum of tails".

Number Theory · Mathematics 2020-11-03 Chris Jennings-Shaffer , Antun Milas

In this paper we add to the literature on the combinatorial nature of the mock theta functions, a collection of curious $q$-hypergeometric series introduced by Ramanujan in his last letter to Hardy in 1920, which we now know to be important…

Combinatorics · Mathematics 2023-04-25 Cristina Ballantine , Hannah E. Burson , Amanda Folsom , Chi-Yun Hsu , Isabella Negrini , Boya Wen

In this paper we consider the first four of the eight identities between the tenth order mock theta functions, found in Ramanujan's lost notebook. These were originally proved by Choi. Here we give an alternative (much shorter) proof.

Number Theory · Mathematics 2014-02-26 Sander Zwegers

We show that some $q$-series such as universal mock theta functions are linear sums of theta quotients and mock Jacobi forms of weight 1/2, which become holomorphic parts of real analytic modular forms when they are restricted to torsion…

Number Theory · Mathematics 2014-01-14 Soon-Yi Kang

This is the first in a sequence of papers to develop the theory of levels in quantum K-theory and study its applications. Our main results in this paper are toric mirror theorems for permutation-equivariant quantum K-theory with level…

Algebraic Geometry · Mathematics 2019-06-18 Yongbin Ruan , Ming Zhang

At the 1987 Ramanujan Centenary meeting Dyson asked for a coherent group-theoretical structure for Ramanujan's mock theta functions analogous to Hecke's theory of modular forms. Many of Ramanujan's mock theta functions can be written in…

Number Theory · Mathematics 2023-08-22 F. G. Garvan , Rishabh Sarma