Explore elementary number theory through the lens of multisets and integral_msets in this 31-minute mathematics lecture. Delve into the Fundamental Theorem of Arithmetic, examining its natural formulation in terms of prime msets for natural numbers. Investigate how prime msets connect to other concepts in elementary number theory and extend the discussion to fractions, incorporating integral_msets. Gain insights into unique factorization, primes, and their relationships within the framework of data structures in mathematics.