Wikipedia talk:WikiProject Mathematics/Archive/2017/Jan

Strange capitalization

I wonder, why some words in section titles become capitalized, here: [1], [2], [3]. Boris Tsirelson (talk) 22:14, 6 January 2017 (UTC)

It is an error. See MOS:SECTIONS: "headings are in sentence case, not title case". Ozob (talk) 03:40, 7 January 2017 (UTC)

Missing topics list

My list of missing topics about mathematics is updated - Skysmith (talk) 14:12, 8 January 2017 (UTC)

Algebraic geometry stubs

I have proposed to create a template for stubs in algebraic geometry. See Wikipedia:WikiProject Stub sorting/Proposals/2017/January#Algebraic geometry stubs.

By the way, a similar problem occurs with the fields in {{maths rating}}. D.Lazard (talk) 11:09, 8 January 2017 (UTC)

A lot of these stubs are pretty low quality, and could use going over by someone with some knowledge of the subject (or even just Wikipedia experience). I've cleared out a couple of stale merge proposals, and added a reference, but there is much more work to be done. Some of these stubs really could use expansion as well. Sławomir Biały (talk) 14:41, 8 January 2017 (UTC)

Top-cited missing journals

WP:JCW, a compilation of 'journal' citations on Wikipedia has recently been updated (see old thread). The top-cited missing journals/works of mathematics are

• Rank 51 Astat info
• Rank 333 Journal of Mathematical Analysis and Applications
• Rank 417 Journal of Computational and Applied Mathematics
• Rank 493 Illinois Journal of Mathematics
• Rank 577 Aequationes Mathematicae
• Rank 653 Congressus Numerantium
• Rank 766 Czechoslovak Mathematical Journal
• Rank 766 Journal of Optimization Theory and Applications
• Rank 894 Journal of Geometry
• Rank 940 Axiomathes
• Rank 940 Journal of Mathematical Sciences
• Rank 940 Nagoya Mathematical Journal

If members of this project could help writing those articles, that would be much appreciated. See our journal-writing guide at WP:JWG for help on writing these articles. Note that some of these might be better as sections of another article (usually publisher, or affiliated society), similar to Australia ICOMOS#Historic Environment. Headbomb {talk / contribs / physics / books} 19:16, 17 January 2017 (UTC)

Functionals, functional derivatives, functional integration and functional equations

Oops, I intended this for the reference desk (wider audience), but mistakenly posted here. I moved it to here YohanN7 (talk) 09:35, 18 January 2017 (UTC)

Draft:Cubinder , Needs improvement with formulae, sources and additional information. (Unlisted)

Hello fellow Wikipedians. I am in the process of creating an article about the 4D shape, the “cubinder”. It was previously red linked on other articles, and I was surprised to see it was not already an item listed for creation by Wiki Projects Mathematics, as the duocylinder and spheriender are already articles. I require help to improve the draft, as I require more formulae, sources, and additional information to create this article. You can access this page at User:Darnburn98/Cubinder, please come on over and help improve this article to get into the main space!Darnburn98 (talk) 22:26, 20 January 2017 (UTC)

Factoriangular number‎

After a unsuccessful prod, I have nominated for deletion this article. See Wikipedia:Articles for deletion/Factoriangular number‎‎, and, please, discuss there. D.Lazard (talk) 09:20, 22 January 2017 (UTC)

WikiJournal of Science promotion

The WikiJournal of Science is a start-up academic journal which aims to provide a new mechanism for ensuring the accuracy of Wikipedia's scientific content. It is part of a WikiJournal User Group that includes the flagship WikiJournal of Medicine.. Like Wiki.J.Med, it intends to bridge the academia-Wikipedia gap by encouraging contributions by non-Wikipedians, and by putting content through peer review before integrating it into Wikipedia. Since it is just starting out, it is looking for contributors in two main areas: Editors See submissions through external academic peer review Format accepted articles Promote the journal Authors Original articles on topics that don't yet have a Wikipedia page, or only a stub/start Wikipedia articles that you are willing to see through external peer review (either solo or as in a group, process analagous to GA / FA review) Image articles, based around an important medical image or summary diagram If you're interested, please come and discuss the project on the journal's talk page, or the general discussion page for the WikiJournal User group.

T.Shafee(Evo&Evo)^talk 10:39, 24 January 2017 (UTC)

Transformation matrix error

https://wiki.riteme.site/wiki/Transformation_matrix

In perspective projection section should be x' = x/w_c and y' = y/w_c instead of x' = x/z and y = y/z

That's meant to be a projection onto the plane $z=1$. In homogeneous coordinates, this is the plane $w_{c}=z$, so actually either form is correct, and the version with z in the denominator seems more natural to me. Sławomir Biały (talk) 12:33, 28 January 2017 (UTC)

Also, the affine coordinates of the image are $(x',y',1),$ and the homogeneous coordinates of the same point are denoted here $(x_{c}:y_{c}:z_{c}:w_{c})$ (note the colons). As the homogeneous coordinates are defined up to the multiplication by a scalar, for defining affine coordinates, they can be used only in a homogeneous way (that is the numerator and the denominator must be both linear in homogeneous coordinates), which is not the case when you write $x'=x/w_{c}.$ D.Lazard (talk) 14:48, 28 January 2017 (UTC)