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Logarithm of the Base Property

The Logarithm of the Base Property states that evaluating a logarithm at its own base always equals 11. If a>0a > 0 and aeq1a eq 1, then logaa=1\log_a a = 1. This property is a fundamental algebraic building block for expanding and simplifying logarithmic expressions, corresponding to the exponential rule that a1=aa^1 = a. For the natural logarithm, this property is written as lne=1\ln e = 1.

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Updated 2026-05-25

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Intermediate Algebra @ OpenStax

Ch.10 Exponential and Logarithmic Functions - Intermediate Algebra @ OpenStax

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