# Natural number/Related Articles

From Citizendium

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

## Parent topics

- Mathematics [r]: The study of quantities, structures, their relations, and changes thereof.
^{[e]} - Number theory [r]: The study of integers and relations between them.
^{[e]} - Number [r]: One of the fundamental concepts of mathematics, used for such purposes as counting, ordering, and measuring.
^{[e]}

## Subtopics

- Numeral system [r]:
*Add brief definition or description* - Peano axioms [r]: A set of axioms that completely describes the natural numbers.
^{[e]} - Elementary arithmetic [r]:
*Add brief definition or description*

- Cardinal number [r]: The generalization of natural numbers (as means to count the elements of a set) to infinite sets.
^{[e]} - Complex number [r]: Numbers of the form
*a+bi*, where*a*and*b*are real numbers and*i*denotes a number satisfying .^{[e]} - Computer science [r]: The study of how computers work, and the algorithms, data structures and design principles used in their operation and programming.
^{[e]}

- Abacus [r]: A mechanical aid to performing arithmetic which dates back many centuries and is still used in modern times.
^{[e]} - Finger [r]:
*Add brief definition or description*