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---
alias: [ "entiers naturels", "entier naturel", "naturels", "naturel" ]
---
up::[[ensembles de nombres]]
#maths
----
# Définition
On construit $\mathbb{N}$ l'ensemble des entiers naturels :
1. $0\in\mathbb{N}$
2. $\forall n\in\mathbb{N}, \exists p\in\mathbb{N}, p=S_{n}$
3. $\not\exists n\in\mathbb{N}, S_{n}=0$
4. $\forall n\in\mathbb{N}, \forall p\in\mathbb{N}, S_{n}=S_{p}\implies n = p$
5. Si $E$ respecte 1. 2. 3. et 4., alors $E=\mathbb{N}$