If you are looking for an accessible book on Measure Theory, I like "Lebesgue Integration on Euclidean Space" by Frank Jones. A good undergraduate level textbook, problems integrated into the text instead of at the end of the chapter. I wish I hadn't given my copy away now.
For number theory I liked "Number Theory and its History" by Oystein Ore. Best part is it is cheap. Good intro to number theory, it was accessible to me in high school (I was advanced, but no genius) and I learned things that I never even encountered in college as a math major.
Comments
If you are looking for an accessible book on Measure Theory, I like "Lebesgue Integration on Euclidean Space" by Frank Jones. A good undergraduate level textbook, problems integrated into the text instead of at the end of the chapter. I wish I hadn't given my copy away now.
For number theory I liked "Number Theory and its History" by Oystein Ore. Best part is it is cheap. Good intro to number theory, it was accessible to me in high school (I was advanced, but no genius) and I learned things that I never even encountered in college as a math major.