# Presentation Markup

Open up the MathFlow Editor and create the following expression. For a detailed tutorial on how to use MathFlow to create equations, please see the Using MathFlow Editor tutorial.

This is simply a nonsensical expression with nothing after the final '+'. While mathematically this makes no sense, it is a good demonstration of how markup styles differ.

## Saving as Presentation

To save the expression as presentation markup just click the OK button. This will insert the markup into the oXygen document.

The MathML that exists in the file would look like the following:

<m:math> <m:mrow> <m:mn>3</m:mn> <m:mo>+</m:mo> <m:mi>x</m:mi> <m:mo>+</m:mo> </m:mrow> </m:math>

Notice that each symbol you typed is shown in the markup, and that the final symbol is a '+'. Continue with the next section for a discussion of Content Markup.