Identity (Equation)/Examples/Difference of Two Squares

Example of Identity in context of Equations

The result Difference of Two Squares:

$\forall x, y \in \R: x^2 - y^2 \equiv \paren {x + y} \paren {x - y}$

is an example of an identity.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): identity
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): identity