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Update peano-derivative.md
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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@@ -27,7 +27,7 @@ PA is five core axioms (in first-order logic, with the equality and logical axio
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5. (P(0) ∧ ∀n: P(n) → P(S(n))) → ∀n: P(n) (induction)
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5. (P(0) ∧ ∀n: P(n) → P(S(n))) → ∀n: P(n) (induction)
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```
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```
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That is the whole thing. Five lines. The natural numbers follow from these.
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That is the whole thing. Five lines. In the standard model, what we call “the natural numbers” are exactly those objects satisfying these axioms.
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## The Derivative
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## The Derivative
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