U+27FA Long Left Right Double Arrow
U+27FA wurde in Version 3.2 in 2002 zu Unicode hinzugefügt. Er gehört zum Block
Dieses Zeichen ist ein Math Symbol und wird allgemein verwendet, das heißt, in keiner speziellen Schrift.
Das Zeichen ist keine Zusammensetzung. Es hat keine zugewiesene Weite in ostasiatischen Texten. In bidirektionalem Text handelt es als Other Neutral. Bei einem Richtungswechsel wird es nicht gespiegelt. Das Wort, das U+27FA mit ähnlichen Zeichen bildet, verbietet in sich Zeilenumbrüche.
Die Wikipedia hat die folgende Information zu diesem Codepunkt:
In logic and related fields such as mathematics and philosophy, "if and only if" (often shortened as "iff") is paraphrased by the biconditional, a logical connective between statements. The biconditional is true in two cases, where either both statements are true or both are false. The connective is biconditional (a statement of material equivalence), and can be likened to the standard material conditional ("only if", equal to "if ... then") combined with its reverse ("if"); hence the name. The result is that the truth of either one of the connected statements requires the truth of the other (i.e. either both statements are true, or both are false), though it is controversial whether the connective thus defined is properly rendered by the English "if and only if"—with its pre-existing meaning. For example, P if and only if Q means that P is true whenever Q is true, and the only case in which P is true is if Q is also true, whereas in the case of P if Q, there could be other scenarios where P is true and Q is false.
In writing, phrases commonly used as alternatives to P "if and only if" Q include: Q is necessary and sufficient for P, for P it is necessary and sufficient that Q, P is equivalent (or materially equivalent) to Q (compare with material implication), P precisely if Q, P precisely (or exactly) when Q, P exactly in case Q, and P just in case Q. Some authors regard "iff" as unsuitable in formal writing; others consider it a "borderline case" and tolerate its use. In logical formulae, logical symbols, such as and , are used instead of these phrases; see § Notation below.
Darstellungen
System | Darstellung |
---|---|
Nr. | 10234 |
UTF-8 | E2 9F BA |
UTF-16 | 27 FA |
UTF-32 | 00 00 27 FA |
URL-kodiert | %E2%9F%BA |
HTML hex reference | ⟺ |
Falsches windows-1252-Mojibake | ⟺ |
HTML named entity | ⟺ |
HTML named entity | ⟺ |
HTML named entity | ⟺ |
LATEX | \Longleftrightarrow |
Anderswo
Vollständiger Eintrag
Eigenschaft | Wert |
---|---|
3.2 (2002) | |
LONG LEFT RIGHT DOUBLE ARROW | |
— | |
Superscripts and Subscripts | |
Math Symbol | |
Common | |
Other Neutral | |
Not Reordered | |
none | |
|
|
✘ | |
|
|
|
|
✘ | |
|
|
|
|
|
|
|
|
|
|
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
|
|
Egal | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
0 | |
0 | |
0 | |
✘ | |
None | |
— | |
NA | |
Other | |
— | |
✘ | |
✘ | |
✔ | |
✘ | |
Ja | |
Ja | |
|
|
Ja | |
|
|
Ja | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✔ | |
✘ | |
✘ | |
✘ | |
✘ | |
Andere | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
Andere | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
✘ | |
|
|
None | |
neutral | |
Nicht anwendbar | |
— | |
No_Joining_Group | |
Non Joining | |
Alphabetic | |
none | |
keine Nummer | |
|
|
R |