In mathematics, the

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**logarithm**is the inverse operation to exponentiation. That means the**logarithm**of a number is the exponent to which another fixed number, the base, must be raised to produce that number. In simple cases the**logarithm**counts factors in multiplication. For example, the base 10**logarithm**of 1000 is 3, as 10 to the power 3 is 1000 (1000 = 10 × 10 × 10 = 103); 10 is used as a factor three times. More generally, exponentiation allows any positive real number to be raised to any real power, always producing a positive result, so the**logarithm**can be calculated for any two positive real numbers b and x where b is not equal to 1. Wikipedia, LogarithmSee Also

**Cause and Its Effects****Geometrical Progression**