User talk:Gandalf61/Archive13

WP:AN/I

Hello. This message is being sent to inform you that there is currently a discussion at Wikipedia:Administrators' noticeboard/Incidents regarding an issue with which you may have been involved. Thank you. — Fly by Night (talk) 04:25, 2 July 2011 (UTC)

Okay. Thanks for letting me know. Gandalf61 (talk) 08:06, 2 July 2011 (UTC)

I have a question about fractals.

Hey Gandalf! I was gonna try to send you an email via the email function here on Wikipedia but I don't think you have your email function enabled. But anyway, my question is about fractals, since you seem to be one of the main contributors on that article. My question is do you know if fractals has found any applications in psychology? I was asking this because I took a random system of thought (Theology, actually); and it seems to be based on a fractal. Please let me know. Thanks! Lighthead ^þ 20:04, 26 August 2011 (UTC)

Actually I wasn't familiar with the Reference desk. I think I'll ask it there. Thanks! Lighthead ^þ 22:45, 26 August 2011 (UTC)

I am not aware of any apllications of fractals in psychology. As you say, the Reference Desk is a good place to try. Gandalf61 (talk) 10:53, 29 August 2011 (UTC)

hello sir

I want to create the article of Atan2(c) function which is used in the math.c library function of c programming code not of trigonametric calculus.I will improve the article within 20 days.[[RahulWaghamare (talk) 13:11, 7 September 2011 (UTC)]]

Wikipedia already has an article on atan2 which covers the implementation of the function in the C library as well as in other programming languages. I have redirected atan2(c) to this page. Please do not remove the redirect again. Gandalf61 (talk) 13:41, 7 September 2011 (UTC)

Eulerian numbers

Hi! I recommend you to read Donald Knuth: "Two notes on notation". There, on page 2: "the additional zero terms are more helpful than harmful". It seems that Donald Knuth (with me following him there) has quite the opposite point of view than you on an equation being simple. With kind regards --84.130.254.70 (talk) 13:51, 7 September 2011 (UTC)

You wanted to change $\sum _{m=0}^{n-1}A(n,m)$ and similar to $\sum _{m=0}^{n}A(n,m)$. But extending the upper limit of the sum is invalid because A(n,n) is not defined for any n > 0. Gandalf61 (talk) 15:57, 7 September 2011 (UTC)

I beg your pardon, Gandalf, but: really? I'd say it is very well defined, even by "is the number of permutations of the numbers 1 to n in which exactly m elements are greater than the previous element" (the combinatorial definition, see Eulerian numbers, first sentence). The other possible definitions (using the generating function or the explicit formula) do also work very well and yield A(n,n)=0 for n>0. You would have to artificially exclude this case to make it undefined. --84.130.254.70 (talk) 16:39, 7 September 2011 (UTC)

Did you read Talk:Eulerian number#Identities? There is no answer since more than a year. But User:TheLaeg is right: The first formula in "Identities" simply doesn't work without A(n,n) being defined. Even in the first formula in the article, defining Eulerian polynomials, A(n,n) is used, isn't it? (It is, however, not the definition used by major authors like D. E. Knuth, D. Foata and F. Hirzebruch, see [1].) The generating function for A(n,k), see [2], also relying on A(n,n) being defined, isn't even contained in the article. What is contained, however, is the good-faith-edit [3] by somebody who doesn't know what is important and what is not, according to himself, see [4]. The article is not going to improve by letting laymen pour their long-winded calculations in it and by reinstating factual errors because of a badly justified point of view on what is "simple", what are "anomalous cases" and what "is not defined" ([5]). --84.130.152.104 (talk) 06:16, 8 September 2011 (UTC)

Hello sir

I will assure that i will improve this article within few days. I will write the information about math.c and not from Trigonometry and how to use it in the c programming.[[RahulWaghamare (talk) 10:47, 8 September 2011 (UTC)]]

dont worry

but forward the messege to him also........ Harshadwaghmare (talk) 16:11, 8 September 2011 (UTC)

Dimentions

It is probably good you removed my paragraph I put in, but I was wondering a few things about it. I don't know a lot about editing yet, so if I made any mistakes please let me know. First of all, did you think what I wrote was/is wrong? Did you remove it because I didn’t cite it? I think I can find sources for it, but I don’t know how to add sources yet. I realize you are probably right in throwing out what I wrote, and I would like to learn from this for any other times I might edit something. Thank you for your time. Balance of paradox (talk) 13:46, 30 September 2011 (UTC)

Yes, you are right - when you add information to Wikipedia you need to provide a reliable source. Adding information like this without a source is called "original research" (OR for short), and is strongly discouraged on Wikipedia. We have a guideline on citing sources, which you might find helpful. Gandalf61 (talk) 15:00, 30 September 2011 (UTC)

Ok, thank you for the info and links. Balance of paradox (talk) 15:59, 30 September 2011 (UTC)

File:Fibonacci spiral.png listed for deletion

A file that you uploaded or altered, File:Fibonacci spiral.png, has been listed at Wikipedia:Files for deletion. Please see the discussion to see why this is (you may have to search for the title of the image to find its entry), if you are interested in it not being deleted. Thank you. Sven Manguard Wha? 08:00, 10 October 2011 (UTC)

Ref Desk - Liam Fox question

Many thanks for your support. Best Richard Avery (talk) 14:05, 11 October 2011 (UTC)

User:Medeis has removed one of your comments on the reference desk [6]. It is being discussed on the talk page. Buddy431 (talk) 19:35, 11 October 2011 (UTC)

Thank you for letting me know. Gandalf61 (talk) 21:11, 11 October 2011 (UTC)