Math Fundamentals18 sections · 814 units
Open in Course

Logarithm of the Base (Another special case)

Always equals one

For any base b>0b > 0, we have logb(b)=1\log_b(b) = 1. Why? Because b1=bb^1 = b.

This means log2(2)=1\log_2(2) = 1, log10(10)=1\log_{10}(10) = 1, and ln(e)=1\ln(e) = 1. You raise the base to the power 11 to get itself back.

These two special cases (logb(1)=0\log_b(1) = 0 and logb(b)=1\log_b(b) = 1) anchor your intuition. Between 11 and bb, logarithms grow from 00 to 11.