Question

Is the equal sign really was invented in 1557

Answer 1

Yes, the equal sign (=) was invented in 1557 by the Welsh mathematician Robert Recorde. He introduced it in his book "The Whetstone of Witte" to avoid the repetition of the phrase "is equal to." Recorde chose the two parallel horizontal lines to represent equality, stating that no two things could be more alike than these two lines. This innovation provided a simple and clear way to denote equality in mathematical expressions.