# 自然數 ℕ

[數學](/math/math.md) ⟩ [數系](/math/num.md) ⟩ 自然數 ℕ

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:star: 注意：現代的「<mark style="color:purple;">自然數</mark>」通常認為是由 0 開始，也就是 $${\color{orange}\mathbb{N}} = { \ 0,1,2,3, \dots \ }$$
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* Wikipedia ⟩&#x20;
  * [Natural number](https://en.wikipedia.org/wiki/Natural_number)
  * [Peano axioms](https://en.wikipedia.org/wiki/Peano_axioms)&#x20;
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自然數的公理化：「皮亞諾公理」
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