Passage from Robert Recorde's 1557 book The Whetstone of Witte in which the equals sign "=" was introduced for the first time. |

**=**symbol or “equals sign” represents an equivalence of the quantities or values on each side, left and right, of its position in a mathematical expression.

Etymology

In 1557, English mathematician Robert Recorde, in his textbook

*The Whetstone of Witte*, introduced the equals symbol “=” as a means of truncation of the words “is equal to”. [1] Specifically, Recorde states: [2]

“To avoid the tedious repetition of the words: is equal to, I will set a pair of parallels, or lines of one length, thus: =, because no two things can be more equal.”

References

1. Bodanis, David. (2000).

*E = mc² - a Biography of the World's Most Famous Equation*(pg. 25). Berkley Books.

2. Recorde, Robert. (1557).

*The Whetstone of Witte:*

*whiche is the seconde parte of Arithmeteke: containing the extraction of rootes; the cossike practise, with the rule of equation; and the workes of Surde Nombers.*Publisher.

External links

● Equals sign – Wikipedia.

● The Whetsone of Witte – Wikipedia.