Even function
From Encyclopedia of Mathematics
A function that does not change sign when the sign of the independent variable is changed, i.e. satisfying the condition 
. The graph of an even function is symmetric about the 
-axis.
Comments
A function that does change sign when the sign of the independent variable is changed, i.e. satisfying the condition 
, is called an odd function.
How to Cite This Entry:
Even function. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Even_function&oldid=14504
Even function. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Even_function&oldid=14504