Logarithms
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Complex Numbers 
Logarithmic Scale and the Slide Rule 
Contents
Basic Description
Logarithms are considered the inverse or opposite operations to exponents, just as subtraction is the inverse to addition or square rooting is the inverse to squaring.
For example, suppose we have the exponential expression , which we know will equal 8. Now, suppose we want to do the inverse operation and go from the value 8 to the exponent 3 with a base of 2. We could do the inverse operation by using logarithms and write , which is read "logarithm of 8 base 2 is equal to 3".
 In order words, if we have an exponential equation:
 we can write an equivalent logarithmic equation:
What about exponential equations such as ? It might seem harder to solve for x in this case because there is no whole number exponent that will give us the value of 932 with a base of 10. However, if we simply rewrite the equation as an logarithmic equation , we can find quite easily with a calculator that x is about 2.969.
To look at some more examples of switching between exponential and logarithmic equations:
A More Mathematical Description
Definition of a Logarithm
if and only if , where b > 1 and x > 0
In words: The logarithm of a value at a given base is the power (exponent) that the base must be raised to produce the value.
Bases
Graphing a Logarithmic Function
Basic Properties of Logarithms
Additional Resources
 Reference used  Wikipedia, Logarithms Page