The Little Book of Mathematical Principles, Theories & Things. Robert Solomon
The Fundamental Theorem of Calculus
The Precession of the Equinoxes
The Seven Bridges of Königsberg
Arithmetic and Geometric Progressions
The Fundamental Theorem of Algebra
The Difference and Analytic Engines
Doubling the Cube and Trisecting the Angle Revisited
The Uncountability of the Reals