Update peano-derivative.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Alexa Amundson
2026-02-27 11:18:09 -06:00
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@@ -27,7 +27,7 @@ PA is five core axioms (in first-order logic, with the equality and logical axio
5. (P(0) ∧ ∀n: P(n) → P(S(n))) → ∀n: P(n) (induction) 5. (P(0) ∧ ∀n: P(n) → P(S(n))) → ∀n: P(n) (induction)
``` ```
That is the whole thing. Five lines. The natural numbers follow from these. That is the whole thing. Five lines. In the standard model, what we call “the natural numbers” are exactly those objects satisfying these axioms.
## The Derivative ## The Derivative