Keynote for iOS is a presentation application specifically designed to work on iOS devices (iPad, iPhone, iPod Touch). There is no way to insert or edit equations in Keynote for iOS, but you can view equations on your device and edit the text of the presentation while preserving the equation.
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MathType is a powerful interactive equation
editor for Windows and Macintosh that lets you create mathematical notation
for word processing, web pages, desktop publishing, presentations,
elearning, and for TeX, LaTeX, and MathML documents. 