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  2. Help:Cite errors/Cite error references duplicate key - Wikipedia

    en.wikipedia.org/wiki/Help:Cite_errors/Cite...

    The quote marks must be the standard, straight, double quotation marks ("); curly or other quotes will be parsed as part of the reference name. You may optionally provide reference names even when the reference name is not required. This makes later re-use of the sourced reference easier.

  3. Help:Table - Wikipedia

    en.wikipedia.org/wiki/Help:Table

    Note that although cell C is in column 2, C is the 1st cell declared in row 3, because column 1 is occupied by cell A, which was declared in row 2. Cell G is the only cell declared in row 5, because cell F occupies the other columns but was declared in row 4.

  4. Category:Pages with duplicate reference names - Wikipedia

    en.wikipedia.org/wiki/Category:Pages_with...

    The named reference "$1" was defined multiple times with different content (see the help page). Where $1 is the <ref> tag name. This indicates that there are multiple <ref> tags (or {{ sfn }} templates) on the page that are generating the same named reference with different body content.

  5. SQL - Wikipedia

    en.wikipedia.org/wiki/SQL

    SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...

  6. Tupper's self-referential formula - Wikipedia

    en.wikipedia.org/wiki/Tupper's_self-referential...

    The formula is a general-purpose method of decoding a bitmap stored in the constant , and it could be used to draw any other image. When applied to the unbounded positive range 0 ≤ y {\displaystyle 0\leq y} , the formula tiles a vertical swath of the plane with a pattern that contains all possible 17-pixel-tall bitmaps.

  7. Multiplication theorem - Wikipedia

    en.wikipedia.org/wiki/Multiplication_theorem

    The finite form typically occurs only for the gamma and related functions, for which the identity follows from a p-adic relation over a finite field. For example, the multiplication theorem for the gamma function follows from the Chowla–Selberg formula, which follows from the theory of complex multiplication.

  8. Einstein notation - Wikipedia

    en.wikipedia.org/wiki/Einstein_notation

    In mathematics, especially the usage of linear algebra in mathematical physics and differential geometry, Einstein notation (also known as the Einstein summation convention or Einstein summation notation) is a notational convention that implies summation over a set of indexed terms in a formula, thus achieving brevity.

  9. Wikipedia:Unusual articles - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Unusual_articles

    Tupper's self-referential formula: A formula that draws itself! Ulam spiral: A bored mathematician discovers an unusual numerical pattern while doodling. Umbral calculus: A mathematical method successfully used for over 100 years, despite the notable limitation of no one on Earth knowing exactly how or why it worked. Unexpected hanging paradox