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

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

2010-08-09

arxiv.org/abs/1008.1469v2

Electron. J. Combin. 18 (1) (2011), #P78

Mathematics

Combinatorics

6 pages, final version

Scientific paper

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.

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