This series can be expressed as a rational function.

The rational function is given correctly, in this case: .

They can also be polynomials - this is a rational function.

It can be shown that these are rational functions.

Let ƒ(x) be any rational function over the real numbers.

This is a rational function (one polynomial divided by another).

Here is an example of a rational function which possesses a Herman ring.

Further, there is a rational function which possesses a Herman ring with period 2.

His method for integrating the rational functions is well known.

This definition can be extended to rational functions as well.