A q-analogue of some binomial coefficient identities of Y. Sun

TL;DR

This paper introduces a q-analogue of certain binomial coefficient identities originally by Y. Sun, providing two proofs including a combinatorial partition-based approach, expanding the understanding of q-binomial identities.

Contribution

It presents new q-analogues of binomial identities and offers two proofs, one combinatorial, enhancing the theoretical framework of q-binomial coefficient identities.

Findings

Established q-analogues of Sun's binomial identities

Provided combinatorial and algebraic proofs

Extended binomial identities to q-analogues

Abstract

We give a $q$-analogue of some binomial coefficient identities of Y. Sun [Electron. J. Combin. 17 (2010), #N20] as follows: {align*} \sum_{k=0}^{\lfloor n/2\rfloor}{m+k\brack k}_{q^2}{m+1\brack n-2k}_{q} q^{n-2k\choose 2} &={m+n\brack n}_{q}, \sum_{k=0}^{\lfloor n/4\rfloor}{m+k\brack k}_{q^4}{m+1\brack n-4k}_{q} q^{n-4k\choose 2} &=\sum_{k=0}^{\lfloor n/2\rfloor}(-1)^k{m+k\brack k}_{q^2}{m+n-2k\brack n-2k}_{q}, {align*} where ${n\brack k}_q$ stands for the $q$-binomial coefficient. We provide two proofs, one of which is combinatorial via partitions.