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.Who would use this?  Wouldn't you probably resort to a reference more specific to your field?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?