Wikipedia talk:WikiProject Mathematics/Archive/2017/Jan

Strange capitalization
I wonder, why some words in section titles become capitalized, here:, ,. 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 WikiProject Stub sorting/Proposals/2017/January.

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. 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 Articles for deletion/Factoriangular number‎‎, and, please, discuss there. D.Lazard (talk) 09:20, 22 January 2017 (UTC)

WikiJournal of Science promotion
T.Shafee(Evo &#38; Evo)talk 10:39, 24 January 2017 (UTC)

Transformation matrix error
https://en.wikipedia.org/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)