$\"\"$

\

The function is $\"\"$

\

The function $\"\"$ , everywhere, except $\"\"$ .

\

At $\"\"$ , $\"\"$ .

\

The function $\"\"$ is constant for all numbers, except $\"\"$ .

\

As $\"\"$ tends to $\"\"$ , $\"\"$ remains at $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .

\