I'm really into mathematics, but I often forget little things and have to look them up on Wikipedia. This doesn't work when I'm backpacking though since I'll be days away from any internet access. I recently forgot how to multiply matrices and it was quite irritating to wait to get hold of a computer to continue my studies. I'm wondering if there's a book with every math formula & theorem, from $a+b=b+a$ to fractional derivatives. I don't want it to have explanations, just formulas & theorems. If it doesn't exist, do you think it would sell well?
I understand that math isn't very linear, so it's very difficult to have a book of formulas without missing anything.
How about a book like this? Or this?