Main Page

From Maths
Jump to: navigation, search
NOTICE: Throughout 2020 Dreamhost keeps messing with PHP settings, and I have to keep manually reverting it, I'm sorry if you get the white screen with "Mediawiki fatal exception" on it. Alec (talk) 16:51, 11 May 2020 (UTC)
Account creation disabled due to spam. To create an account... Alec (talk) 20:36, 28 November 2017 (UTC)
Email me at "alec" the usual email symbol here, then "" if you want one, I'll create it and email you back with credentials. The accounts created and sifting the spam - even with my Quick-Block modifications is too great!

Making full use of the site

The best interface by far is the search box this project is intended to create a queriable resource for looking up things and learning from them (and those pages will link to related and required topics), for some examples try searching for the following:

  • Norm
  • Inner product
  • Category
  • Linear map
  • Dynkin system

Some pages may be rather sparse, containing little more than a definition, but there is always some information even if it is minimal. This site follows the doctrines of monotonic definition and of least surprise. For example the term "ring without unity" violates monotonic definition, we only ever add properties. And the notation [ilmath]\mathbb{R}_+[/ilmath] is ambiguous and can violate the doctrine of least surprise.

This site goes through great effort to use a consistent, natural and unambiguous notation for everything, it also aims to document alternate notations

This site uses MathJax for mathematical rendering, which uses vector fonts to create sharp and all round superb renderings of mathematical equations. This site also uses XyJax for diagrams, (see Xypic for an example) allowing large diagrams, state machines and so forth to be rendered.

First years

Topics which first years are likely to cover (for example sequences, equivalence relations and so forth) are so called "first-year friendly" pages. This means they are written verbosely and with plenty of explanation in order help those new to the topic. A good example is the limit of a sequence page which gives two almost identical definitions, the experienced mathematician will both not care about the difference and also not need help interpreting the definition, the newcomer will need help, so very clear hand-holding proofs are presented (in a collapsed section, click expand to show) as well as an extended discussion as to why the definition works, including an animated diagram (albeit a low-res capture from a graphic calculator (at the time of writing))

  • The category Category:First-year friendly contains 18 pages, this number is lower than the actual number as not all first-year friendly pages have been categorised. If you're a first year, and you search for stuff, it should be friendly.


This resource is useful to check definitions and theorem statements, to see discussion of notation, and to understand dependencies of a definition, for example if you encounter a Dynkin system you can see other names for it, but also 2 distinct definitions (with references) which are proved equivalent. Thus saving you the work of doing it yourself


Definitions and theorem statements are always at the top of the page and not verbose, describing the conditions followed by the name of the object or outcome of the theorem. It will be very useful as a "refresher" or checking terminology, however it may not contain some of the rare material you look for. Feel free to request material or add to the project.

Lists of covered items

(All the following statistics are as of Wednesday, 19/Jun/2024 at 06:43)

  • There are 2,259 pages in total
  • There are 1,077 pages in the main namespace that are counted as articles (I must find out what qualifies as an article)
  • All definitions - contains 838 pages (across 2 subcategories)
  • Definitions (mathematics) - contains 819 pages (across 24 subcategories)
  • Computer science definitions - 0 pages (across 0 subcategories)
    • Note: it's hard to tell just what is CS and what is mathematics (these get quite blurred) so CS usually refers to the things which are to do with computers, and was created to contains things like register based computing machine
  • Theorems - containing 239 (across 16 subcategories) (this is difficult to count, see Category:Theorems, lemmas and corollaries for more, there are many more, some trivial and not worthy of their own page)

Slightly related is the category of exemplary pages (containing 7 pages), which showcases the best pages of this site.

In the spirit of openness there is also the category of dire pages (containing 18 pages), which contains pages that are not short, but woefully incomplete and in dire need of content.

Index category

This category contains indexing pages, these are used for things like notation, operators, structures and objects, so forth. This project is always changing, if you make particular use of something or think the current way is good, please comment on the appropriate talk page.

Mathematical subject index

(Note, if a link is read, it does not mean this site doesn't cover the subject, it just means that there is no introductory page to the subject


Old list of "areas"

Commonly needed things

Good (finished) pages

Editing tips