Definition:Order Type of Natural Numbers
From ProofWiki
Definition
Consider the set of natural numbers $\left({\N, \le}\right)$ where $\le$ is interpreted in its conventional meaning.
That is, $\N$ arranged in increasing order $0, 1, 2, \ldots$
The order type of $\left({\N, \le}\right)$ is denoted $\omega$ (omega).
Sources
- A.N. Kolmogorov and S.V. Fomin‎: Introductory Real Analysis (1968): $\S 3.3$