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Definition

Common Logarithmic Function

The common logarithmic function is a logarithmic function where the base is exactly 1010. It is defined as f(x)=log10xf(x) = \log_{10} x, where x>0x > 0. By mathematical convention, when the base of a logarithm is 1010, it is typically not written. Therefore, the function is generally expressed simply as f(x)=logxf(x) = \log x. If a logarithm is written without an explicit base, it is always assumed to be 1010. The logarithmic equation y=logxy = \log x is mathematically equivalent to the exponential equation x=10yx = 10^y.

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Updated 2026-05-25

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