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Important style guides and useful help

Important Style guides and useful help

meta:Help:Formula - for TeX markup in Wikipedia
Wikipedia:Manual of Style (mathematics)
Wikipedia:Manual of Style (China-related articles)
Wikipedia:Userboxes
Wikipedia:Template messages
Wikipedia:Duplicate articles - use {{merge|OTHER ARTICLE}}
Wikipedia:Administrator intervention against vandalism - to block
Wikipedia:Requests for expansion
Wikipedia:WikiProject Stub sorting and Wikipedia:WikiProject Stub sorting/Stub types
Wikipedia:Footnotes - If citing something, put <ref> Reference </ref> after it. *If citation is missing, put {{fact}} for ^{[citation needed]}
1. "{{dubious}}" for "^{[dubious – discuss]}"
2. {{Citation needed}} for ^{[citation needed]}
Wikipedia:Refactoring talk pages
Help:Interlanguage links en de fi etc.; Help:Interwiki linking one scope step further
Category:Wikipedia maintenance templates
Category:Disambiguation and redirection templates
Category:Templates using ParserFunctions and m:ParserFunctions and m:Help:Magic words
mw:Manual:Extensions, mw:Manual:Extensions and mw:Category:All extensions for useful markup extensions such as <source lang="php">
Wikipedia:NavFrame and Wikipedia:Collapsible tables - frankly speaking, I love 'em
How to find the deletion discussion of an article:
- the awkward way: look in the Deletion log to obtain date and time of a deletion, then look at Wikipedia:Archived delete debates near that time to see which edit regards the unlisting of the page, then view the previous version.
- the probably not always working easier way: directly go to Wikipedia:Articles for deletion/ARTICLENAME
Wikipedia:WikiProject Inline Templates

WIP

Relations Chart

Heterogeneous Relations

	Left and Right Unique, Left-Total Injective Function (One-to-One Function)
		Uniqueness				Totality

Relations		Left-Unique (Injective Relation)		Right-Unique (Functional Relation) (Right-Definite) (Partial Function)		Left-Total (Multivalued Function) (Total)	Right-Total (Surjective Relation)

		Left and Right Unique (Injective Partial Function) (One-to-One Relation)				Left and Right Total (Correspondence Relation)

				Right-Unique and Right-Total (Surjective Partial Function)	<------------------>		Right-Unique and Right-Total (Surjective Partial Function)

		Functions			Right-Unique and Left-Total Function (Total Function)


			Right-Unique, Left and Right Total Surjective Function (Correspondence Function) (Onto Function)

	Left and Right Unique, Left and Right Total Bijective Function (Injective and Surjective Function) (One-to-One and Correspondence Relation)

Equivalence Relation Example

An Equivalence Relation Partitions a set into Collectively Exhaustive and Mutually Exclusive subsets called Equivalence Classes.

Original Set

\{a,b,c,d,e,f,g,h\}\,

Partition

{\Big \{}{\color {RoyalBlue}\{a,b,c\}},\ {\color {BrickRed}\{d,e\}},\ {\color {ForestGreen}\{f,g\}},\ {\color {Orange}\{h\}}{\Big \}}

Graph

{\begin{aligned}\{&{\color {RoyalBlue}(a,a),(a,b),(a,c),(b,a),(b,b),(b,c),(c,a)(c,b)(c,c),}\\&{\color {BrickRed}(d,d),(d,e),(e,e),(e,d),\ }{\color {ForestGreen}(f,f),(f,g),(g,g),(g,f),\ }{\color {Orange}(h,h)}\}\\\end{aligned}}

Directed Graph

Equivalence Classes form "Squares" in Matrices.

Matrix

{\begin{bmatrix}{\color {RoyalBlue}1}&{\color {RoyalBlue}1}&{\color {RoyalBlue}1}&0&0&0&0&0\\{\color {RoyalBlue}1}&{\color {RoyalBlue}1}&{\color {RoyalBlue}1}&0&0&0&0&0\\{\color {RoyalBlue}1}&{\color {RoyalBlue}1}&{\color {RoyalBlue}1}&0&0&0&0&0\\0&0&0&{\color {BrickRed}1}&{\color {BrickRed}1}&0&0&0\\0&0&0&{\color {BrickRed}1}&{\color {BrickRed}1}&0&0&0\\0&0&0&0&0&{\color {ForestGreen}1}&{\color {ForestGreen}1}&0\\0&0&0&0&0&{\color {ForestGreen}1}&{\color {ForestGreen}1}&0\\0&0&0&0&0&0&0&{\color {Orange}1}\\\end{bmatrix}}

Set Union can be used to test for Collectively Exhaustive (Union of all Equivalence Classes = Original Set) and Set Intersection for Mutually Exclusive (zero for any Intersection).