For those of you who have been poking my profile, you may have noticed that Arron and I have several sets of notes like Algebra Techniques and Olympiad Combinatorics which have not yet been reshared. (And now you know about them!). These notes serve to explain a concept in a clear, concise manner (as opposed to presenting specific problems), and are filled with posts from the technique trainer.
I know that lots of members have already written up great notes in the past few months, and they deserve to be placed in here. Please nominate posts which you think should be added to our list, by stating the title (preferably add a link), author, and which topic it belongs in. For example
Deriving Trigonometric Identities by Daniel Liu, trigonometry / geometry
We will also be creating sets for other topics like Physics, Computer Science, Chemistry, etc, so feel free to nominate posts in those areas too!