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The double-headed arrow representing logical equivalence was introduced by Albrecht Becker in Die Aristotelische Theorie der Möglichkeitsschlüsse, Berlin, 1933. [ 4 ] Knuth's up-arrow notation uses multiple up arrows, such as ⇈, for iterated, or repeated, exponentiation ( tetration ).
Moore, Lisa (2014-11-10), "Consensus 141-C2", UTC #141 Minutes, Create formal aliases of type "correction" for Unicode 8.0 for 2B7A LEFTWARDS TRIANGLE-HEADED ARROW WITH DOUBLE HORIZONTAL STROKE and 2B7C RIGHTWARDS TRIANGLE-HEADED ARROW WITH DOUBLE HORIZONTAL STROKE: N4739 "M64.06", Unconfirmed minutes of WG 2 meeting 64, 2016-08-31
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
The Arrows block contains eight emoji: U+2194–U+2199 and U+21A9–U+21AA. [3] [4]The block has sixteen standardized variants defined to specify emoji-style (U+FE0F VS16) or text presentation (U+FE0E VS15) for the eight emoji, all of which default to a text presentation.
double-arrow blue and red: File usage. The following 4 pages use this file: User:OranL; Wikipedia:Wikipedia Signpost/2014-06-04/Op-ed; Wikipedia talk:Wikipedia ...
The double-headed eagle was used in the breakaway Empire of Trebizond as well. Western portolans of the 14th–15th centuries use the double-headed eagle (silver/golden on red/vermilion) as the symbol of Trebizond rather than Constantinople. Single-headed eagles are also attested in Trapezuntine coins, and a 1421 source depicts the Trapezuntine ...
Double Arrow or Double arrow may refer to: a subset of arrows in Unicode; the British Rail Double Arrow logo, now officially known as the National Rail Double Arrow;