## Abstract

We study the Andrews-Gordon-Bressoud (AGB) generalisations of the Rogers-Ramanujan q-series identities in the context of cylindric partitions. We recall the definition of r-cylindric partitions, and provide a simple proof of Borodin's product expression for their generating functions, that can be regarded as a limiting case of an unpublished proof by Krattenthaler. We also recall the relationships between the r-cylindric partition generating functions, the principal characters of sˆl_{r} algebras, the _{r} ^{r,r+d} minimal model characters of W_{r}algebras, and the r-string abaci generating functions, providing simple proofs for each. We then set r = 2, and use two-cylindric partitions to re-derive the AGB identities as follows. Firstly, we use Borodin's product expression for the generating functions of the two-cylindric partitions with infinitely long parts, to obtain the product sides of the AGB identities, times a factor (q;q)^{-1} _{∞}, which is the generating function of ordinary partitions. Next, we obtain a bijection from the two-cylindric partitions, via two-string abaci, into decorated versions of Bressoud's restricted lattice paths. Extending Bressoud's method of transforming between restricted paths that obey different restrictions, we obtain sum expressions with manifestly non-negative coefficients for the generating functions of the two-cylindric partitions which contains a factor (q;q)^{-1} _{∞}. Equating the product and sum expressions of the same two-cylindric partitions, and canceling a factor of (q;q)^{-1} _{∞} on each side, we obtain the AGB identities.

Original language | English |
---|---|

Article number | 164004 |

Journal | Journal of Physics. A, Mathematical and theoretical |

Volume | 49 |

Issue number | 16 |

DOIs | |

Publication status | Published - 17 Mar 2016 |

## Keywords

- affine and Virasoro characters
- cylindric partitions
- Rogers-Ramanujan identities