Maeckes logo

<    1      2    >


Equal sign

In mathematics, at the left and right of the equal sign (=) the same is stated.

 


Example 1

Some simple calculations are

If left and right are not identical you have a mathematical error.

 


Example 2

You can solve the equation

x2 = 2x

because for x = 2 you get

22 = 22     ⇒     4 = 4

and that's right. That you could see quickly. But there are more solutions. By careful thinking and trying you can figure them out.

 


Example 3

In Euler's formula, you can fill in the definitions of the sine and the cosine, and then you find

 


History

The Welsh mathematician Robert Recorde introduced the = sign in 1557 in his book The Whetstone of Witte.


Deutsch   Español   Français   Nederlands   中文