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unicode equals sign

[1] In LaTeX mathematical formulas, the code \equiv produces the triple bar symbol and \not\equiv produces the negated triple bar symbol as output. ( For this reason it is sometimes recommended to avoid the == operator in JavaScript in favor of ===. a Starting in algebra courses, the sign takes on a relational meaning of equality between two calculations. The === operator is flexible and may be defined arbitrarily for any given type. For example, HC≡CH is a common shorthand for acetylene[17] (systematic name: ethyne). In chemistry, the triple bar can be used to represent a triple bond between atoms. In chemical formulas, the two parallel lines denoting a double bond are commonly rendered using an equals sign. [20], "=" and "=" redirect here. x For instance, the expression 0 == false is true, but 0 === false is not, because the number 0 is an integer value whereas false is a Boolean value. [14] An alternative notation for this usage is to typeset the letters "def" above an ordinary equality sign, to test for equality. [citation needed] The letters BT stand for Break Text, and are put between paragraphs, or groups of paragraphs in messages sent via Telex,[citation needed] a standardised tele-typewriter. In linguistic interlinear glosses, an equals sign is conventionally used to mark clitic boundaries: the equals sign is placed between the clitic and the word that the clitic is attached to.[16]. The triple bar symbol ≡ (U+2261, LaTeX \equiv) is often used to indicate an identity, a definition (which can also be represented by U+225D ≝ EQUAL TO BY DEFINITION or U+2254 ≔ COLON EQUALS), or a congruence relation in modular arithmetic. The Approximately Equal symbol (≈) is a mathematical operator used to indicate that two expressions or statements are similar but not exactly equal to each other. ) However, in most languages where = has one of these meanings, a different character or, more often, a sequence of characters is used for the other meaning. [18][better source needed], Symbols used to denote items that are approximately equal include the following:[1][19]. ≡ 1. = The symbol for a less than or equal to is ≥. In his book Recorde explains his design of the "Gemowe lines" (meaning twin lines, from the Latin gemellus[5], And to auoide the tediouſe repetition of theſe woordes : is equalle to : I will ſette as I doe often in woorke vſe, a paire of paralleles, or Gemowe lines of one lengthe, thus: =, bicauſe noe .2. thynges, can be moare equalle. a In an equation, the equals sign is placed between two expressions that have the same value, or for which one studies the conditions under which they have the same value. mod Arrows in Unicode. There are many different ways to insert these signs. Following ALGOL, most languages that use = for equality use := for assignment, although APL, with its special character set, uses a left-pointing arrow. In mobile, web, and general application design, a similar symbol is sometimes used as an interface element, where it is called a hamburger icon. b for all x. The language B introduced the use of == with this meaning, which has been copied by its descendant C and most later languages where = means assignment. The symbol has been used since 1995 by the Human Rights Campaign, which lobbies for marriage equality, and subsequently by the United Nations Free & Equal, which promotes LGBT rights at the United Nations. [17], In Morse code, the equals sign is encoded by the letters B (-...) and T (-) run together (-...-). The symbol || was used by some and æ (or œ), from the Latin word aequalis meaning equal, was widely used into the 1700s" (History of Mathematics, University of St Andrews).[7]. f Most programming languages, limiting themselves to the 7-bit ASCII character set and typeable characters, use ~=, !=, /=, or <> to represent their Boolean inequality operator. The equals sign is also used as a grammatical tone letter in the orthographies of Budu in the Congo-Kinshasa, in Krumen, Mwan and Dan in the Ivory Coast. JavaScript has the same semantics for ===, referred to as "equality without type coercion". {\displaystyle f\equiv g} The equals sign was reserved for this usage. The equals sign is sometimes used incorrectly within a mathematical argument to connect math steps in a non-standard way, rather than to show equality (especially by early mathematics students). Visually, the symbol is a squiggly equals sign. A possibly unique case of the equals sign of European usage in a person's name, specifically in a double-barreled name, was by pioneer aviator Alberto Santos-Dumont, as he is also known not only to have often used a double hyphen resembling an equals sign = between his two surnames in place of a hyphen, but also seems to have personally preferred that practice, to display equal respect for his father's French ethnicity and the Brazilian ethnicity of his mother.[15]. For double hyphens, see, Usage in mathematics and computer programming, ITU (International Telecommunications Union) International Telecommunications Regulations, List of mathematical symbols § Symbols based on equality, "The History of Equality Symbols in Math", the third page of the chapter "The rule of equation, commonly called Algebers Rule. [10][11] It is also used for "identical equality" of functions; one writes The equals sign or equality sign, =, is a mathematical symbol used to indicate equality in some well-defined sense. [18] Usage of this symbol dates back to the early computer interfaces developed at Xerox PARC in the 1980s. Confusion between the two uses of the sign sometimes persists at the university level. In Ojibwe, the readily available equal sign on a keyboard is used as a substitute for a double hyphen. [6], In mathematics, the triple bar is sometimes used as a symbol of identity or an equivalence relation (although not the only one; other common choices include ~ and ≈). It combines the greater than symbol > and the equals symbol = together. Additional symbols in Unicode related to the equals sign include:[19]. ≢, ≢) is the same symbol with a slash through it, indicating the negation of its mathematical meaning. A few languages, such as BASIC and PL/I, have used the equals sign to mean both assignment and equality, distinguished by context. x {\displaystyle f(x)=g(x)} 1844 === (1800..1899) is false, since it is interpreted to mean Integer#=== rather than Range#===.[11]. 0 == false is false. As well as Fortran, = is used for assignment in such languages as C, Perl, Python, awk, and their descendants. [9] In number theory, it has been used beginning with Carl Friedrich Gauss (who first used it with this meaning in 1801) to mean modular congruence: d [13], This symbol is also sometimes used in place of an equal sign for equations that define the symbol on the left-hand side of the equation, to contrast them with equations in which the terms on both sides of the equation were already defined. [4] The original form of the symbol was much wider than the present form. The etymology of the word "equal" is from the Latin word "æqualis",[3] as meaning "uniform", "identical", or "equal", from aequus ("level", "even", or "just"). [5] Gottlob Frege used a triple bar for a more philosophical notion of identity, in which two statements (not necessarily in mathematics or formal logic) are identical if they can be freely substituted for each other without change of meaning. Of X by 2 acetylene [ 17 ] ( systematic name: ethyne ) operator: X X. 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