U+21A0 Rightwards Two Headed Arrow
U+21A0 was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Puntuación matemática and is commonly used, that is, in no specific script. El carácter es también conocido como z notation total surjection y fast cursor right.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+21A0 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The CLDR project calls this character “flecha de doble punta hacia la derecha” for use in screen reading software.
El Wikipedia tiene la siguiente información acerca de este punto de código:
In mathematics, a surjective function (also known as surjection, or onto function ) is a function f such that, for every element y of the function's codomain, there exists at least one element x in the function's domain such that f(x) = y. In other words, for a function f : X → Y, the codomain Y is the image of the function's domain X. It is not required that x be unique; the function f may map one or more elements of X to the same element of Y.
The term surjective and the related terms injective and bijective were introduced by Nicolas Bourbaki, a group of mainly French 20th-century mathematicians who, under this pseudonym, wrote a series of books presenting an exposition of modern advanced mathematics, beginning in 1935. The French word sur means over or above, and relates to the fact that the image of the domain of a surjective function completely covers the function's codomain.
Any function induces a surjection by restricting its codomain to the image of its domain. Every surjective function has a right inverse assuming the axiom of choice, and every function with a right inverse is necessarily a surjection. The composition of surjective functions is always surjective. Any function can be decomposed into a surjection and an injection.
Representaciones
Sistema | Representación |
---|---|
N.º | 8608 |
UTF-8 | E2 86 A0 |
UTF-16 | 21 A0 |
UTF-32 | 00 00 21 A0 |
URL-Quoted | %E2%86%A0 |
HTML hex reference | ↠ |
Mojibake mal de windows-1252 | ↠|
HTML named entity | ↠ |
HTML named entity | ↠ |
alias | z notation total surjection |
alias | fast cursor right |
LATEX | \twoheadrightarrow |
Caracteres relacionados
Confundibles
Otros sitios
Registro completo
Propiedad | Valor |
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1.1 (1993) | |
RIGHTWARDS TWO HEADED ARROW | |
RIGHT TWO HEADED ARROW | |
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