Mathify - Math Editor app
Mathify is an ongoing project aimed to be full math editor and CAS
-For greek symbols include greek in your native keyboard.
-To select formula longpress on a formula or text.
-To activate zoom using pinch gestures tap with two fingers then start to zoom. To deactivate zoom mode tap with single finger.
-For power or index (superscript, subscript) use '_' (underscore) for sub and '^' for super scripts.
For Big Operators (integrals, sum, product ....) choose type of limits and to add limits press '_' (underscore) for lower limit and '^' for upper limit.