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Rational Numbers

Rational numbers are integers plus fractions.

In other words number is rational, if it can be written as fraction `p/q` (we know that every integer `m` can be written as fraction `m/1`).

So, -4, -10, 0, 2, 23, `-4/5`, `-3 2/5`, `-15/7`, `2/3`, `9/4`, `5 10/11` are all rational numbers.

Thus, rational numbers include

Set of rational numbers, i.e. group of rational numbers, is denoted by `QQ`.