===== Rational number =====
==== Set ====
| @#FFBB00: definiendum | @#FFBB00: $ \mathbb Q \equiv \mathbb Z\times (\mathbb Z\setminus \{0\})\ /\ \{\langle \langle a,b\rangle,\langle m,n\rangle\rangle\ |\ a\ n - b\ m = 0 )\} $ |

with $a,b,n,m\in \mathbb Z$

==== Discussion ====
=== Reference ===
Wikipedia: [[http://en.wikipedia.org/wiki/Rational_number|Rational number]]
==== Parents ====
=== Subset of ===
[[Real number]]
=== Context ===
[[Arithmetic structure of integers]], [[Quotient set]]
=== Related ===
[[Rational numbers]]