Mathematical Girls

Shortly after the high school entrance ceremony, I meet Milka, a beautiful girl and a mathematical genius. She presents me with numerous mathematical problems and introduces me to elegant solutions. We spend long hours discussing mathematics in the school library. A year later, I meet Tetra, another girl with a passion for mathematics. One year younger than me, she asks me to teach her. As I guide her, she gradually comes to understand mathematics and appreciate its elegance. The first volume covers Fibonacci numbers, harmonic numbers, finite and infinite sums, factorization, the Basel problem, integer partitions, and generating functions.