Pages and Keynote in Mac and iOS have default built-in capability to enter equations. Latex is the language used to enter equations into these apps. Latex is a large type-setting environment. The apps are using only the equations entry capability of Latex.
In this tutorial, I explain the fundamental techniques to enter equations. You will learn how to type symbols that are not present on the keyboard, such as greek symbols and mathematical operators. You should definitely follow the Blah Tex PDF for the full documentation of other symbols and techniques in order to type other less commonly used symbols and formats.
