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equals sign
The equals sign or equality sign (=) is a mathematical symbol used to indicate equality. It was invented in 1557 by Robert Recorde. In an equation, the equals sign is placed between two expressions that have the same value. It is assigned to the Unicode and ASCII character 003D in hexadecimal, 0061 in decimal.
==History==
The etymology of the word "equal" is from the Latin word "''aequalis"'' as meaning "uniform", "identical", or "equal", from ''aequus'' ("level", "even", or "just").
The "=" symbol that is now universally accepted in mathematics for equality was first recorded by Welsh mathematician Robert Recorde in ''The Whetstone of Witte'' (1557). The original form of the symbol was much wider than the present form. In his book Recorde explains his design of the "Gemowe lines" (meaning ''twin'' lines, from the Latin ''gemellus''〔See also geminus and Gemini.〕):
''… 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.''
… to avoid the tedious repetition of these words: "is equal to", I will set (as I do often in work use) a pair of parallels, or Gemowe lines, of one length (thus =), because no two things can be more equal.
According to Scotland's University of St Andrews History of Mathematics website:〔(【引用サイトリンク】 website = MacTutor History of Mathematics archive )〕
The symbol '=' was not immediately popular. The symbol || was used by some and ''æ'' (or ''œ''), from the Latin word ''aequalis'' meaning equal, was widely used into the 1700s.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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