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This is the 12th video in a series of 21 by Dr Vincent Knight of Cardiff University. In LaTeX we can label equations for easy reference within the article. Here we see how to create an equation using the and commands. This equation is automatically numbered, and by including a \label command, we can refer to this number from anywhere within the rest of the document using the \ref command. To try this for yourself, click here to open the 'Equations' example.