I was wondering,
is it possible to allow for simple latex formatting on iMessage? At least for just greek letters, it shouldn't be too different from the emoticons support.
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It is actually possible to send arbitrarily complex LaTeX formulae with the help of LaTeXiT. The trick is fairly simple:
PNG. I also suggest to set the Scale to 250%, but this is a matter of taste.
iMessage -> Servicesmenu and choose any of the LaTeXiT services (for instance, the "Display" one)
PS: In case you don't see the service in the menu, go to your system preference and activate it:
The Emoticons you are talking about are Emojis.
The emojis are part of the Unicode set. Apple provides a keyboard for this set of unicode characters.
What you need is a keyboard that provides the unicode characters you want. Maybe just adding a greek keyboard in the system settings could solve your problem.
A dirty solution: use LaTeXiT (http://pierre.chachatelier.fr/latexit/latexit-home.php?lang=en), simply type whatever you need to write into iMessage there, then copy the result as an image and paste it into iMessage.