User talk:Scythe33

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Zzyzx11 | Talk 21:39, 29 Apr 2005 (UTC)

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[edit] Edit summary

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Oleg Alexandrov 17:58, 25 May 2005 (UTC)

[edit] More welcome

Welcome also to Wikipedia:WikiProject Mathematics. Its talk page serves as a place where the mathematicians gather together and discuss math-related issues. There is also a list of participants to sign on. Enjoy Wiki-ing! Oleg Alexandrov 01:42, 11 Jun 2005 (UTC)

[edit] Question

In coversine you added the text:

The derivative of the coversine is the versine

\frac{d}{dx}\mathrm{cvs}x = \mathrm{vrs}x\,

and the integral is:

\int \mathrm{cvs}(x)\,dx = \frac{\sin^2{x}}{\mathrm{vrs}x} + C.

Now, from what I see there, one has

cvsx = 1 − sinx

and

versin(θ) = 1 − cos(θ).

But then, it is quite easy to see that both formulas you put are false. Am I misunderstanding something? Oleg Alexandrov 02:14, 11 Jun 2005 (UTC)

No, I made a mistake. Thanks, it was late where I live. It should be

\frac{d}{dx}\mathrm{cvs}x = -\cos{x}
\int \mathrm{cvs}x dx = x + \cos{x}

(i ignored the constants like they were multiplied).

[edit] Twelfth root of two

This looks a lot better with your edit. Thanks. hydnjo talk 19:32, 7 August 2005 (UTC)

[edit] Brown numbers

In reference to 71, what are Brown numbers? What professional mathematical papers deal with the properties of Brown numbers? PrimeFan 23:01, 8 August 2005 (UTC)

Brown numbers are a pair of numbers (a,b) such that:
a^2 = b!+1\,\!
The only known pairs are (5,4) (11,5) (71,7). I got it off of a MathWorld article.
Excellent! That is a neat concept. We just need to find out how far Erdos's conjecture has been checked and we got enough meat for a stub.
So the Wikipedia article should perhaps be at [[Brown numbers]] rather than [[Brown number]]s. PrimeFan 21:10, 9 August 2005 (UTC)

[edit] See also sections

Hi, I just removed the see also section from Harmonic number and I suspect this will irritate you, so I bring this up now ... I would much prefer to have the "see also" section to list only those "related articles" that are not already somehow wikilinked in the main text of the article. This seems to be quite the opposite of how you tend to edit this section; thus, I invite you to discuss this further on Wikipedia talk:WikiProject Mathematics so as to figure out what the appropriate policy should be. You can bring this up, or if you wish, ask me & I'll broach the subject. (Or we can let Oleg do this for us ...) linas 23:50, 30 August 2005 (UTC)

Why me? :)
Actually, there is a policy that articles already linked from the text should not show up at see also. I can't find it right now, but I am sure it exists. Oleg Alexandrov 00:02, 31 August 2005 (UTC)
Found!. Oleg Alexandrov 00:05, 31 August 2005 (UTC)

[edit] Upload, series.

To upload an image, just go to the left hand column in click on "Upload file" (second link from the bottom). Be sure to study the tutorial on how to use images and/or experiment first on your homepage.

As to Trigamma function, you called a double integral a "series representation". That's wrong. A "series representation" for a function f(x) is something of the form

f(x)=\sum_n a_n x^n\,

An "integral representation" would be

f(x) = \int g(x) dx\,

and what you have in the trigamma article is a double integral representation. Also, to make double integrals more readable, please put the dx's on the left, not the right, like so:

f(x) = \int_0^x dy\;g(y) \int_0^y dz\; h(z)

Otherwise, even a minor slipup with the limits of the integration an make the expresion hard or impossible to read. linas 00:12, 9 October 2005 (UTC)

[edit]  ?!

I looked at the article and didn't see an integral being referred to as a series. I did say it could be derived from the series representation, however. I'll fix the integrals in about half an hour.

Oh, well, scanning teh text quickly, it seems to say "derived from the series rep" and the very next thing one sees is an integral.
Regarding images, I just noticed someone put up new "scalable vector graphics" images in Bessel function, which look rather pretty to me. If you do start adding images to these articles, I'd suggest/recommend using SVG graphics. (Clicking on the image in Bessel function will give the gnuplot markup needed to output SVG). I mean, I think it would be good to have some sort of basic graphs for the special functions, and most of the articles don't have these. linas 20:42, 9 October 2005 (UTC)
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