# Irrational number/Related Articles

From Citizendium, the Citizens' Compendium

*See also changes related to Irrational number, or pages that link to Irrational number or to this page or whose text contains "Irrational number".*

## Parent topics

- Real number [r]: A limit of the Cauchy sequence of rational numbers.
^{[e]} - Complex number [r]: Numbers of the form
*a+bi*, where*a*and*b*are real numbers and*i*denotes a number satisfying .^{[e]}

## Commonly used irrational numbers

- E (mathematics) [r]: Constant real number equal to 2.71828 18284 59045 23536... that is the base of the natural logarithms.
^{[e]} - Pi (mathematics) [r]:
*Add brief definition or description*

- Fraction (mathematics) [r]: A concept used to convey a proportional relation between a part and the whole consisting of a numerator (an integer — the part) and a denominator (a natural number — the whole).
^{[e]} - Integer [r]: The positive natural numbers (1, 2, 3, …), their negatives (−1, −2, −3, ...) and the number zero.
^{[e]}