I think this is an appropriate companion to anything you would want write up in LaTex but can't remember what it's called: http://detexify.kirelabs.org/classify.html

Detexify is also available as an android app. Much easier to draw on a touchscreen than with a mouse.

Woo. I wrote the backend for this. See the comments on reddit:

http://www.reddit.com/r/math/comments/bu580/springers_new_la...