![]() ![]() ![]() In his book Recorde explains his design of the "Gemowe lines" (meaning twin lines, from the Latin gemellus) Īnd 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. The original form of the symbol was much wider than the present form. The = symbol, now universally accepted in mathematics for equality, was first recorded by Welsh mathematician Robert Recorde in The Whetstone of Witte (1557). ![]() From The Whetstone of Witte (1557) by Robert Recorde. The first use of an equal sign, equivalent to 14 x+15=71 in modern notation. The etymology of the word "equal" is from the Latin word " æqualis", as meaning "uniform", "identical", or "equal", from aequus ("level", "even", or "just"). It was invented in 1557 by Robert Recorde. In Unicode and ASCII, it has the code point U+003D. 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 same value. 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. A well-known equality featuring the equal sign ![]()
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