y=∫dx, correlation ≠ causation. This is ∞ely useful.
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you have a keyboard on iOS that let's you type Leibniz integral sign et al.? :)
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Use the opt key in combo with the regular keys. Lots of the most useful symbols are there. Also holding down a key will show opts
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thx! let me play around to see what all I can find...all math chars would be awesome ;)

