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The equals sign (British English) or equal sign (American English), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. [1] In an equation , it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the ...
2. Denotes the additive inverse and is read as minus, the negative of, or the opposite of; for example, –2. 3. Also used in place of \ for denoting the set-theoretic complement; see \ in § Set theory. × (multiplication sign) 1. In elementary arithmetic, denotes multiplication, and is read as times; for example, 3 × 2. 2.
It was common into the 18th century to use an abbreviation of the word equals as the symbol for equality; examples included æ and œ , from the Latin aequฤlis. [10] Diophantus's use of แผดσ , short for แผดσος (ísos 'equals'), in Arithmetica (c. 250 AD) is considered one of the first uses of an equals sign. [11]
The triple bar character in Unicode is code point U+2261 ≡ IDENTICAL TO (≡, ≡). [1] The closely related code point U+2262 โข NOT IDENTICAL TO (≢, ≢) is the same symbol with a slash through it, indicating the negation of its mathematical meaning.
๐ ๐ ๐ ๐ ๐ ๐ ๐ U+1D7Ex ๐ ๐ก ๐ข ๐ฃ ๐ค ๐ฅ ๐ฆ ๐ง ๐จ ๐ฉ ๐ช ๐ซ ๐ฌ ๐ญ ๐ฎ ๐ฏ U+1D7Fx ๐ฐ ๐ฑ ๐ฒ ๐ณ ๐ด ๐ต ๐ถ ๐ท ๐ธ ๐น ๐บ ๐ป ๐ผ ๐ฝ ๐พ ๐ฟ Notes 1. ^ As of Unicode version 16.0 2. ^ Grey areas indicate non-assigned code points
See History of algebra: The symbol x. 1637 [2] René Descartes (La Géométrie) ... (less-than or equals to sign and greater-than or equals to sign) 1670 (with the ...
The history of mathematical notation [1] covers the introduction, development, and cultural diffusion of mathematical symbols and the conflicts between notational methods that arise during a notation's move to popularity or obsolescence. Mathematical notation [2] comprises the symbols used to write mathematical equations and formulas.
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]