log (logarithm) In mathematics, the exponent expressing the power to which a fixed number (base) must be raised to equal a given number (antilogarithm). Logarithmic functions are the inverses of expo-nential functions. In an equation expressed as: bn = x where b and x are known, a logarithm can be used to discover n, and is expressed as n = log (x) b For example, log (1000) = 3 because 103 = 1,000 10 |