User talk:Jacobolus/Archive 2021

Ways to improve Göran Dillner
Hello, Jacobolus,

Thank you for creating Göran Dillner.

I have tagged the page as having some issues to fix, as a part of our page curation process and note that:

"Please add more sources and some context to the page, thanks for creating the page..."

The tags can be removed by you or another editor once the issues they mention are addressed. If you have questions, leave a comment here and begin it with. Remember to sign your reply with. For broader editing help, please visit the Teahouse.

Delivered via the Page Curation tool, on behalf of the reviewer.

Queer Eco feminist [they/them/their] 06:22, 3 August 2021 (UTC)


 * I don’t think such tags are worthwhile on a very short stub, which anyone who looks can tell needs work to meet any kind of minimal quality standard. If you are worried about whether Dillner is notable, you can see more about him in Swedish wikipedia. –jacobolus (t) 07:05, 3 August 2021 (UTC)

Dummy variables
Hi, Jacobolus.

In the lemniscate elliptic functions article, I noticed that you wrote expressions like
 * $$\int_x^1 \frac{x^2\mathop{\mathrm{d}x}}{\sqrt{1 - x^4}}.$$

Mathematicians generally discourage others from using this "notation". It is akin to (for example)
 * $$\sum_{n=1}^n \frac{1}{n}.$$

Please consider changing it to (for example)
 * $$\int_x^1 \frac{t^2\mathop{\mathrm{d}t}}{\sqrt{1 - t^4}}.$$

I would have edited the page myself but you use this notation in the accompanying diagram as well. A1E6 (talk) 23:57, 28 August 2021 (UTC)

discussion you might be interest
see Talk:Domain (mathematical analysis). I would appreciate your opinion.--SilverMatsu (talk) 15:19, 19 September 2021 (UTC)
 * Thank you for improving the article. Now we don't have to worry about choosing region or domain in other articles.--SilverMatsu (talk) 23:15, 26 October 2021 (UTC)

Welcome back
Jacob, I missed you for about 5 years, especially on color-related articles. Good to see you active here again, even if on stuff too esoteric for me to understand. Dicklyon (talk) 01:55, 9 October 2021 (UTC)

Relevance of periods in "Methods of computation"
Hi jacobolus,

I meant "irrelevant" in the context of computation which is what that section is about (regardless of how the formulas were arrived at). We could list all the stuff used to prove the formulas, but that really doesn't belong in that section.

This brings me to the Landen transformations algorithm... But Landen transformations are the key element of it and "deserve" to be mentioned. However, in the case of other computation methods, stuff other than the periods is "in the background" as well, such as the location of the roots and poles. A1E6 (talk) 11:04, 30 October 2021 (UTC)

Minimal periods in the complex plane
Hi jacobolus,

The concept of minimal periods in the complex plane is not defined anywhere on Wikipedia as far as I know (but it is used in the "Lemniscate elliptic functions" article). However, "Fundamental period" for real functions is defined in the "Periodic function" article. There's also the "Fundamental pair of periods" article, but it doesn't mention the concept of minimal periods. So it needs to be defined somewhere (characterization by minimizing the absolute value of the period, etc.). A1E6 (talk) 21:44, 30 October 2021 (UTC)
 * Can we keep conversations at Talk:Lemniscate elliptic functions? –jacobolus (t) 23:45, 30 October 2021 (UTC)