Solved and Unsolved Problems in Number Theory, Daniel Shanks

Problems Solved and Unsolved Concerning Linear and Nonlinear Partial

Problems Solved and Unsolved Concerning Linear and

3,000 Solved Problems in Linear Algebra

The Millennium Problems: The Seven Greatest Unsolved Mathematical Puzzles of...

Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathemat,

The Story of Mathematics: From Ancient Babylon to the Last Unsolved Problems

The Riemann Hypothesis: The Greatest Unsolved Problem in Mathematics