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# Logarithms

### What are logarithms?

In this post, we define logarithms as indices: y = a^{x} is equivalent to x = log_{a}y , and explain why this definition only makes sense when a = 0, a \neq 1 , as a part of the Prelim Maths Advanced course under the topic Exponential and Logarithmic Functions and sub-part Introducing Logarithms. A logarithm answers the question “how many times do we multiply one number to get another number?”

The following two videos cover the definition of a logarithm and clearly goes over examples.