The classical sets of numbers

The integers are

The set of all the integers is denoted by ; the set of all the non-negative integers is equal to and is sometimes denoted also by and the set of non positive integers is denoted by . There are also the rational numbers, whose set is denoted by and the set of real numbers, denoted by .

- The natural numbers

- The integers
- An equivalence relation on
- The set of integers
- Ordering
- Division
- The Euclidean Division
- The Euclidean algorithm

- Applications of the Euclidean algorithm
- Rational numbers

- Prime Numbers

- Applications of prime factorisation
- Modular Arithmetic
- Solving Congruences

- Euler's Phi Function

root 2002-06-10