I strongly recommend the street fighting mathematics book. It is short and full of good stuff.
I end up helping otherwise smart people with techniques from this book all the time.
Here it is in PDF. http://mitpress.mit.edu/books/full_pdfs/Street-Fighting_Mathematics.pdf
The link is broken. Seems that MIT has an e-book storefront and understandably wants to charge for the electronic version.
Current link. The book is free.
I strongly recommend the street fighting mathematics book. It is short and full of good stuff.
I end up helping otherwise smart people with techniques from this book all the time.
Here it is in PDF. http://mitpress.mit.edu/books/full_pdfs/Street-Fighting_Mathematics.pdf
The link is broken. Seems that MIT has an e-book storefront and understandably wants to charge for the electronic version.
Current link. The book is free.