User talk:Num Ref

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Hello, Num Ref, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful: I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or ask your question on this page and then place  before the question. Again, welcome! Victuallers (talk) 16:06, 24 June 2010 (UTC)
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Thank you. Num Ref (talk) 17:07, 24 June 2010 (UTC)

Catalan number
I removed your recent edit to Catalan number because it was a sentence fragment and I couldn't figure out how to fix what you were trying to express. Please accept my apology for not figuring out your intent; please edit the page again, aiming for a little more clarity&mdash;so that even I can understand it :-) Quantling (talk) 17:04, 25 June 2010 (UTC)


 * Look at the numbers in the centers of rows in Pascal's triangle. Look at the sequence of Catalan numbers. Look at Pascal's triangle again. Look at the Catalan numbers again. You'd be very annoyed with me if I didn't let you figure out this very simple fact for yourself. Num Ref (talk) 22:17, 29 June 2010 (UTC)

The Catalan numbers are $$\binom{2n}{n}/(n+1)$$ and the numbers in the middle of the rows of Pascal's triangle are $$\binom{2n}{n}$$, so they differ by a factor of $$n+1$$; I get that. Your added text followed immediately after an alternative expression for the nth Catalan number, $$\binom{2n}{n} - \binom{2n}{n+1}$$, but your text,
 * "Or by looking up the nth center number in Pascal's triangle (a central binomial coefficient) and dividing it by n. "

appears to be aiming to give (again) the article's original formula for the Catalan number. If you have a different intent, or are trying to get at something subtler than I can recognize, please feel to continue discussing that here ... or to edit the article directly. Best -- Quantling (talk) 15:33, 30 June 2010 (UTC)


 * No, you got it exactly right. So I was wrong by one little detail, the whole thing must be deleted!? Is that the Wikipedia way? I have no interest in becoming a Wikipedia warrior. How do I cancel my Wikipedia membership? Num Ref (talk) 20:39, 30 June 2010 (UTC)

I have given you the wrong impression, and I apologize for that. If it were the n vs. (n+1) thing I could have and would have corrected that myself, and I would not have reversed your entire edit. The reason I reversed the edit is that even with the corrected n+1 factor it looked redundant. That is, the article appeared to me to say that one could define the Catalan number as A or B or A, with the second A being the redundant one. Together with the fact that your edit was not a complete sentence, I decided that it should be removed.

However, it was clear to me that you were trying to say something and that it could be important, which is why I went to the extra step of alerting you to my change. Please, if I have erred, don't give up. Either make the edit as you think it should be, or continue to discuss it here with me. I am just another editor, so I have no authority to say that I'm right and you are wrong, and that it must be my way; my power is only that I can have discussions such as these and hope that I am convincing! Thanks -- Quantling (talk) 10:43, 1 July 2010 (UTC)

Promotional purposes
This template message may be overkill in your case, but it has some links you may find useful. Best -- Quantling (talk) 13:22, 1 July 2010 (UTC)

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