Double-click the Equation Editor icon to launch the program. Once it haslaunched, enter the following into the main text box: \sum_{i=0}^{n} {n \choose i} = 2^n Click the "LaTeX" button to typeset the equation. If all has gone well,a graphic should appear in the blank area above the main text box. To insert the equation into Keynote, just drag it. To save the equationas a PDF file, either drag the graphic to the Desktop (or some otherfolder), or click on "Export..." under the File menu. Dragging theequation to the Desktop or a folder will create a PDF file named"image-NNN.pdf" where NNN is replaced by a numeric index. If you wouldlike something a bit more descriptive, rename the file or use Export...,as that allows you to specify a different name for the file.