Natural numbers

Natural numbers are positive integers, starting from 1 (not 0). They’re used for counting discrete objects.

However, in computer science, natural numbers often include 0 as well.

In short, they are the set of numbers used for counting and ordering.

Notation

The set of natural numbers is usually denoted by the symbol \mathbb{N}:

\mathbb{N} = \{0, 1, 2, 3, 4, 5, \ldots\}

or:

\mathbb{N} = \{1, 2, 3, 4, 5, \ldots\}

(0 may or may not be included, depending on the context.)

Question	Answer
What are natural numbers in mathematics?	Positive integers starting from 1, used for counting discrete objects.
How do natural numbers in computer science often differ from mathematical definition?	They often include 0 as well.
What is the typical symbol used to denote the set of natural numbers?	\mathbb{N}
What are two possible definitions for the set \mathbb{N}?	\mathbb{N} = \{0, 1, 2, 3, 4, 5, \ldots\} or \mathbb{N} = \{1, 2, 3, 4, 5, \ldots\} (0 may or may not be included).