Introduction to Pure Mathematics for Advanced High School Students consists of a series of lessons in Logic, Set Theory, Abstract Algebra, Number Theory, Real Analysis, Topology, Complex Analysis, and Linear Algebra.
Lesson 12 from this series covers primes, GCD, and LCM. In this lesson we will prove that there are infinitely many primes and the Fundamental Theorem of Arithmetic. Additionally, we learn about primes, greatest common divisors, least common multiples, and we will learn how to use