It looks like all the sources are primary research papers by a single author/research group. This is not enough to show WP:N. I've tried to declined it, but may have messed up as its hard to do without the helper script. --Salix alba (talk): 19:06, 5 February 2016 (UTC)[reply]
I'm currently attending this workshop which is charged with producing a white paper on how to make (or the prospects for making) progress towards a library of mathematics suited to today's digital world. As there are already a number of candidate languages in current use there are questions of who such a GDML is for, how compatible or intertranslatable the extent candidates are, whether the initial focus should be at the level of vocabulary, syntax, ambiguity (in either vocabulary or syntax), functions, concepts, or semantics, and like questions.
Are there members of WikiProject Mathematics who feel they could usefully represent the wikiproject's (or more generally Wikipedia's) attitudes towards, and opinions about, GDML's goals, prospects, methodology, etc.? Vaughan Pratt (talk) 20:36, 5 February 2016 (UTC)[reply]
When discussing semantics and ontologies, especially upper ontologies, it is very easy to fall into the trap of endlessly discussing abstract systems of classification, and formal languages for talking about mathematics. For all the tremendous amount of work that has gone into the semantic web, for instance, there is no one ontology that is universally accepted.
In this context, I think the most useful thing a Wikipedia approach can bring to this project is to urge the group to be relentlessly practical. There already exist practical ontologies on which to hang mathematical knowledge: for example, the Mathematics Subject Classification scheme and Wikipedia's own set of categorical classifications for mathematical topics. These should be built on, rather than a new ontology created ab initio. The other fundamental practicality is that any knowledge incorporated into the GDML must be easily verifiable. This is especially true if some sort of machine learning automatic summarization is going to be attempted. Neutrality would be good, too, but is perhaps too ambitious at the outset. My two cents, --Mark viking (talk) 19:58, 6 February 2016 (UTC)[reply]
Hello there. Recently I am reading matrix calculus and there is one scalar-by-matrix identity that I could not understand.
According to my understanding and nominator layout, it should be
while the wiki page suggests that it should be instead. There is no such identity in the matrix cookbook (perhaps we can replace the matrix A with I in derivative #124?), so I seek your advice.Estorva (talk) 14:04, 5 February 2016 (UTC)[reply]
@Estirva and @Tsirel: You deficiency of TeX skills is showing. Here's a comment I just left on the talk page of the article discussed here:
When one writes {\rm tr} in TeX one does not get proper spacing before and after "tr". Thus
is coded as a {\rm tr} B, and
is coded as a \operatorname{tr} B, and
is coded as a \operatorname{tr} (B).
Writing \operatorname{tr} results in a certain amount of space before and after tr, and there is less space when (round brackets) follow tr than when they don't. The form {\rm tr}, on the other hand, involves no spacing conventions. The form \operatorname{tr} is standard usage and I edited accordingly.
Surely I use "operatorname" (if not "DeclareMathOperator") when TeXing my articles, lecture notes etc. But this is not article, just discussion, and I did copy-paste from Estorva (who in turn did copy-paste from the article, as you alreardy know). Boris Tsirelson (talk) 06:18, 8 February 2016 (UTC)[reply]
And let us avoid biting the newcomers (by such words as "your deficiency of TeX skills"); save this for us seniors. Estorva is here from Feb 5, 2016. Boris Tsirelson (talk) 21:45, 8 February 2016 (UTC)[reply]
(from propagator and history) are bad. In the first, the prime is misplaced. In the second, the dagger fails to penetrate its victim and there is an ugly gap between the i and the del operator. Does anyone know of a workaround (or even a supported feature)? YohanN7 (talk) 10:05, 4 February 2016 (UTC)[reply]
For Feynman slash notation, I would put the prime after the nabla, before the shifted slash, as in
No, I am not. There, editors ask simple but somewhat special mathematical questions (about vectors and operators in a Hilbert space) and accepts answers only in the form of a reliable source that treats literally the given question; any combination of two (or more) sources is rejected as OriginalResearchBySynthesis. Is there a mathematician able to satisfy them? If you are, please help them. Boris Tsirelson (talk) 11:03, 10 February 2016 (UTC)[reply]
I'm wondering if Spacetime triangle diagram technique should be moved either to Spacetime triangle diagram or to Spacetime triangle? (I found the article full of crude solecisms, some of which I cleaned up, and bizarrely over-complicated TeX code written by a psychotic (which probably means it was written by some software package of the kind used by people who don't know TeX code) and I cleaned up some of that too.) Ceteris paribus, I think shorter titles are better, partly because they're more likely to be found by using the search box. Michael Hardy (talk) 19:58, 16 February 2016 (UTC)[reply]
The user, Ryanexler is planting a reference in various articles. He/she (most likely to be Jakob Schwichtenberg ) has done this once before (last year) and was then reverted by me. I don't feel like being this mans nemesis around here. Someone else should have a look. YohanN7 (talk) 12:30, 12 February 2016 (UTC)[reply]
I have added a "mergefrom" tag to it, which may be controversial. There is a large overlap between the two articles. The rationale for creating a separate article with a separate title is explained by R. J. Gray in this section of my user talk page.
It strikes me that the article might better be titled "On a Property of the Collection of All Real Algebraic Numbers" after the title of Cantor's article. Or perhaps it should be named "Ueber eine Eigenschaft des Inbegriffes aller reellen algebraischen Zahlen" after the original title. It's a very nice article. Ozob (talk) 04:03, 13 February 2016 (UTC)[reply]
Good catch. I think the copy was done in good faith; the whole text was put in a blockquote. It may be too extensive for fair use. I put up a {{copypaste}} notice on the article to encourage a rewrite. --Mark viking (talk) 04:20, 17 February 2016 (UTC)[reply]
Thanks to both of you for bringing this to my attention! Yes, I had indeed thought blockquoting the text, which is only a small section of the paper I copied it from, would constitute 'fair use'. Further, I couldn't think of how to rephrase it in my own words, given it's mostly technical definitions that I felt I could only make small changes to the wording of - which would then constitute plagiarism. This then brought me back to simply blockquoting. But having now read Wikipedia:Copying text from other sources, and that I don't know how to rewrite the text in a non-plagiarising way, I will accept the article in its current form simply being deleted. Sorry for my mistake! --Thoughtactivist (talk) 05:50, 17 February 2016 (UTC)[reply]
It would be easy enough to rewrite the definitions so they are not copyvios; I can try later this afternoon, perhaps. More important (from the editorial point of view) would be to add a few sentences saying why anyone would care about these things. @Thoughtactivist:, can you do that? --JBL (talk) 14:40, 17 February 2016 (UTC)[reply]
I've done some editing on this article. If it was a copyright violation earlier, it probably is not now. It didn't have a proper introductory sentence; I've added that. Michael Hardy (talk) 18:48, 17 February 2016 (UTC)[reply]
Recap: I am blind and a newbie, but an expert on the Jacobian Conjecture(JC). Around January 20, I proposed a change to the JC article on the talk JC page, under the title Symmetric Case. I pointed to it here, but the pointer was archived with no action. Needs a reference to two papers by the same two authors in the same year. Please help.
de Bondt, Michiel; van den Essen, Arno. The Jacobian conjecture for symmetric Druzkowski mappings. Ann. Polon. Math. 86 (2005), no. 1, 43--46. MR2183036 (2006i:14069)
P.K. Adjamagbo and A. van den Essen (2007) and Alexei Belov-Kanel and Maxim Kontsevich (2007) showed that the Jacobian conjecture is equivalent to the Dixmier conjecture.
I have created the System U article and would appreciate if somebody checked its wikiness. Also, looking at related articles, I noticed they have this WikiProject's rating template on their talk pages. I don't know what the process around these is, but this article should probably have one as well. —Matěj Grabovský (talk) 12:37, 19 February 2016 (UTC)[reply]
Thanks for your contribution! This looks like a well-formatted start-class article to me and I've added the wikiproject template. As a layman in this field, I don't understand the notation in your formal definition section. You might add a few words of explanation. --Mark viking (talk) 13:51, 19 February 2016 (UTC)[reply]
I'd like to get P-value fallacy in WP:DYK. (User:Sunrise gets all the credit, not me.) It'd be nice to have a decent mathematics article on the Main Page. I'd appreciate it if a few stats people looked it over and/or suggested a good "hook" for it. Realistically speaking, we probably can't expect to find very many stats people among the DYK reviewers, so I'm asking here. If anyone has comments, please be bold, or leave notes on the article's talk page. WhatamIdoing (talk) 01:56, 22 February 2016 (UTC)[reply]
In this section I found only two sieve methods listed, not including the sieve of Eratosthenes about which everyone learns in elementary school, and which is in fact the only one that I know anything about. I added several more. Quite possibly the section needs more work. Maybe even subsections on different kinds of sieves? Or maybe not? Michael Hardy (talk) 18:43, 25 February 2016 (UTC)[reply]
The main subject is how to extract accurate, automated bibliographic citations from websites. This talk is mostly about Zotero, which is a free and open-source citation management tool. Zotero is used on the Wikipedias through the automagic citoid service. Citoid is currently an option in the visual editor and will (eventually) be used for automated citations in the wikitext editor at some Wikipedias. Zotero is also used by many academics and researchers, and most of the information presented will be useful to people outside of Wikipedia as well.
Would this be a related question?: Do page numbers in references cited in Wikipedia obey Benford's law? Gathering data to examine this would be quite onerous without software designed for the purpose. Michael Hardy (talk) 18:52, 25 February 2016 (UTC)[reply]
Could someone please take a look at this article. The "Gimel" hebrew letter in the images looks like a Nun rather than a Gimel. A Gimel has a foot in the lower right.Naraht (talk) 22:00, 26 February 2016 (UTC)[reply]
Hmm, the article uses inline LaTeX, which we tend to discourage, but in any case it's producing from the code <math>\gimel</math>, so if it's wrong, then it's actually wrong in our TeX rendering engine, not just the article. --Trovatore (talk) 00:38, 27 February 2016 (UTC)[reply]
The unicode for HEBREW LETTER GIMEL is ג, which looks more like what you describe, but less like what I've seen used to notate the gimel function. Maybe this is an issue of calligraphic style or something? Anyway, the version in the article looks like what I've seen in Jech, for example. --Trovatore (talk) 00:49, 27 February 2016 (UTC)[reply]
It looks like this is pretty much the way the character works in the font used by LaTeX, using the amssymb package. I did it on my local machine with \Huge and a fontsize of 20, and took a screenshot . You can see that ther is a "foot", but it's very small, and when it's cut down to the size in the article, it's not surprising you can't see it. --Trovatore (talk) 21:34, 27 February 2016 (UTC)[reply]
Exactly, the entry in Jeck's writing clearly shows the foot, the Wiki engine output of the LaTeX looks like a completely different Hebrew letter. The best comparison that I could give outside Hebrew would be if the LaTeX Capital Omega was shown without the two tails and as such it looked like an Omicron or a Latin Alphabet O. What can be we do make it look like what is in Jeck's article?Naraht (talk) 05:17, 28 February 2016 (UTC)[reply]
The letter should look like File:GimelLaTeX.png which clearly has the foot, the question is why the use of that letter in the article doesn't have the foot. Are the bottom lines of pixels being cut off? (Note, in this font, the letters are as different looking as ג and נ — Preceding unsigned comment added by Naraht (talk • contribs)
It probably depends on (1) your browser, OS, and what fonts you have loaded, and (2) the setting in your Wikipedia preferences for how you want math to be rendered. For me (using Chrome on OS X with the "MathML/SVG fallback" option turned on, which with that browser uses the SVG fallback rendering) the png file and the formula look basically the same. But this confusion of rendering combinations also means that trying to do something complicated to make it look better for you may be a waste of time if it ends up making things look worse for people with other settings and browsers. —David Eppstein (talk) 05:54, 28 February 2016 (UTC)[reply]
It turns out that there's a unicode GIMEL SYMBOL which is distinct from HEBREW LETTER GIMEL and looks like the one we want. We should probably change to use that, so that we don't have the sizing problems of inline PNG files. --Trovatore (talk) 06:06, 28 February 2016 (UTC)[reply]
Here's how it looks in inline text: ℷ. And inside {{math}}: ℷ. Presumably one advantage of using this unicode would be that it works in left-to-right text unlike the usual right-to-left ordering that you get when you use Hebrew text unicodes. The page I got the character from [2] says: "You need a font that supports this character to even have a hope of seeing it correctly in the browser." I'm not convinced that I have a good enough font because for me it just looks like some kind of sans-serif lambda instead of like the big image above. —David Eppstein (talk) 06:31, 28 February 2016 (UTC)[reply]
Hmm, yeah, on yours it looks the same as HEBREW LETTER GIMEL as far as I can tell. Well, not an ideal solution then. Still might be better than the PNGs? --Trovatore (talk) 06:47, 28 February 2016 (UTC)[reply]
Oh well. Nothing to be done, I guess. Someone should set a reminder to look at this again in a few years, see if browsers have caught up. --Trovatore (talk) 21:40, 28 February 2016 (UTC)[reply]
![[3]](http://www.ics.uci.edu/~eppstein/gimel-screenshot.png){kind=link}