Last updated on May 15th, 2017

Here’s a quick tutorial on the L2 or Euclidean norm.

First of all, the terminology is not clear. So let’s start with that.

### Many equivalent names

All these names mean the same thing:

`Euclidean norm == Euclidean length == L2 norm == L2 distance == norm`

Although they are often used interchangable, we will use the phrase “`L2 norm`

” here.

### Many equivalent symbols

Now also note that the symbol for the `L2 norm`

is not always the same.

Let’s say we have a vector, .

Continue reading “What does the L2 or Euclidean norm mean?”