Mathematics all-in-one cheat-sheet (2013) [pdf]
Wow, I have to say I feel somewhat bad for the author who spent so much time (months?) compiling this semi-comprehensive reference work.  There's so much information, but at the same time, so little useful information to any particular reader.  It's so broad as to be a hindrance to using it in any sort of daily reference.<p>Who would use this?  Wouldn't you probably resort to a reference more specific to your field?<p>Is this the product of someone's superficial fascination with mathematical equations combined with OCD to copy down everything ever read, gone awry?  Or is this like a strange version of a Noah Webster?