There's a nice binomial identity I am trying to understand. There are various algebraic proofs, but I am really interested in a combinatorial proof.

Some reading lead me to a monograph by a French mathematician that contains a combinatorial proof. Unfortunately, I don't speak French and I wasn't able to figure it from the text without it.

  1. Can I ask a question asking for assistance in explaining the proof by members with some proficiency in French? (The monograph is available freely from the author's website)

  2. If the answer to the previous question is negative, can you suggest me who to turn to with this problem?

  • 1
    $\begingroup$ I as a low level user see no problem in what you asked. $\endgroup$
    – yiyi
    Jan 20, 2013 at 5:51

4 Answers 4


Yes, you are welcome to do so.

  • $\begingroup$ (This is an opinion, and not necessarily an official position of the website. I'm posting it as an answer in part so that up/downvotes can show agreement/disagreement.) $\endgroup$ Jan 19, 2013 at 19:23
  • 10
    $\begingroup$ I agree. "Here is a proof that I cannot follow" questions are better than "Prove X, kthx" -- in particular when the OP specifies the confusing part(s). $\endgroup$
    – user53153
    Jan 19, 2013 at 20:00
  • $\begingroup$ Thank you for the approval, from the upvotes and Georges's answer I assume that this answer is accepted not only be me but also by the community. I will go over the proof in a few days and try to summarize my difficulties. $\endgroup$
    – Ofir
    Jan 20, 2013 at 13:14

I'm French, and speak English fluently. I'd be glad to help you.


French a foreign language? 100,000,000 (or rather 100.000.000) people just say NON !
More seriously, of course you can ask for assistance!

  • 5
    $\begingroup$ It is foreign to StackExchange network, in the sense that SE does not speak it... this is actually a serious drawback, for a site with global reach to not have language options for user interface, etc. $\endgroup$
    – user53153
    Jan 20, 2013 at 20:49
  • $\begingroup$ I think that this a plus in the sense that most programming documentation is in English as well. If you know English, you have access to most of the content. Making localized questions would require me to check with at least two languages. $\endgroup$ Jan 20, 2013 at 21:04
  • 3
    $\begingroup$ Dear friends, my first line was just a childish joke: don't read anything serious in it. I'm perfectly happy with English being the new international language, taking over the role Latin used to have. $\endgroup$ Jan 20, 2013 at 21:32

I can also be of help with the French


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