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Aug 21, 2022 at 21:30 comment added Nikifuj908 Sweet solution. It expands to a nice proof by induction as well.
Jul 16, 2011 at 17:22 comment added Steven Sam @Gadi, if you're worried about cancellation, you can work with the field Z/p(x,y), where x and y are transcendentals.
Jul 15, 2011 at 16:10 vote accept Gadi A
Jul 15, 2011 at 16:10
Jul 15, 2011 at 1:32 comment added Gerry Myerson @Gadi, the intermediate coefficients may not all be divisible by $q$, but they are all divisible by $p$, so the equation holds in any field of characteristic $p$.
Jul 14, 2011 at 19:14 comment added Gadi A However, I'm not sure if it proves what I asked (although the identity above is what I was really after). How it shows that all the intermediate coefficients are divisible by q? They might have simply canceled each other out.
Jul 14, 2011 at 19:13 comment added Gadi A Ok, I got it, your solution is quite elegant. Thanks!
Jul 14, 2011 at 19:13 vote accept Gadi A
Jul 14, 2011 at 19:14
Jul 14, 2011 at 18:49 comment added Gadi A Can you elaborate what you mean by "repeat"?
Jul 14, 2011 at 17:51 history answered Steven Sam CC BY-SA 3.0