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Oct 16, 2018 at 3:12 vote accept T. Amdeberhan
May 19, 2017 at 12:28 comment added T. Amdeberhan That's a cute observation, Fedor!
May 19, 2017 at 10:38 answer added Fedor Petrov timeline score: 7
May 19, 2017 at 10:23 comment added Fedor Petrov it is interesting for $x=0$: we get that two different $q$-analogs of $\sum \binom{y-k}{n-k}$ are equal.
May 19, 2017 at 4:21 history edited J. M. isn't a mathematician
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May 18, 2017 at 20:39 answer added Pietro Majer timeline score: 11
May 18, 2017 at 20:24 answer added Gjergji Zaimi timeline score: 20
May 18, 2017 at 20:05 history edited T. Amdeberhan CC BY-SA 3.0
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May 18, 2017 at 18:51 history asked T. Amdeberhan CC BY-SA 3.0