Cologarithm

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In mathematics, the base-b cologarithm of a number, sometimes shortened to colog, is the base-b logarithm of the multiplicative inverse of the number. This means that

\operatorname{colog}_b\ x = \log_b \left(\frac{1}{x} \right) = -\log_b x = \log_{1/b} x.\,

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