# *Logarithms Let a is an arbitrary positive real number except 0. If ax = y, then logay = x

***Logarithms **

Let a is an arbitrary positive real number except 0. If a^{x} = y, then log_{a}y = x

Conversely, the antilogarithm of x is the number y i.e. y = antilog_{a}x.

Here a^{x} = y is called arbitrary exponential function and log_{a} y = x is read is log of y to the base a is equal to x. If a = 10, log is called common & if it is e, then called natural.