Math
Natural log.
Definition
The natural logarithm (ln) is the logarithm with base e, where e ≈ 2.71828. It answers the question: to what power must e be raised to get a given number?
Examples
Real-world.
- 1 ln(e) = 1 because e¹ = e
- 2 ln(1) = 0 because e⁰ = 1
- 3 Finding the half-life of a radioactive substance using ln(2)
Key Fact
ln(e) = 1, ln(1) = 0, ln(eˣ) = x, e^(ln x) = x