A function is a special relationship where each input has a single output. It is often written as $y=f(x)$ where $x$ is input and $y$ is the output value.

- Say $x_1,x_2∈D$

$f(x_1)=f(x_2)$ if $x_1=x_2$

or, $f(x_1)≠f(x_2)$ if $x_1≠x_2$

then the function is called a one-to-one function. Where D is the set of decimal numbers. - if $f(-x)=f(x),$ then it is called even function
- if $f(-x)=-f(x),$ then it is called odd function

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