---
tag: 04DXAFN2ES
kind: concept
name: Natural logarithm
msc: [33B10, 26A09]
sources:
  - url: https://en.wikipedia.org/wiki/Natural_logarithm
    locator: lead section
same_as:
  wikidata: Q204037
  wikipedia: Natural logarithm
---

## Summary

The natural logarithm is the inverse of the exponential function. It is defined for positive numbers, it turns products into sums, and its derivative is $1/x$. The node [[natural logarithm|0044CPHJBV]] gives the precise definition.