In Fortran, = serves as an assignment operator: X = 2 sets the value of X to 2. The first important computer programming language to use the equal sign was the original version of Fortran, FORTRAN I, designed in 1954 and implemented in 1957. "), or to express a universal equivalence (" ( x + 1) 2 = x 2 + 2 x + 1"). In mathematics, the equal sign can be used as a simple statement of fact in a specific case (" x = 2"), or to create definitions (" let x = 2"), conditional statements (" if x = 2, then. Usage in mathematics and computer programming 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). "The symbol = was not immediately popular. And 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 duplicate lines of one length, thus: =, because no 2 things can be more equal.
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.
#Approximately equal symbol symbols code
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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