Direct Sums: Abelian GroupsExplores the concept of direct sums in abelian groups, emphasizing the universal property and homomorphisms.
Direct Sums: Lemme 1.2Delves into direct sums of abelian groups, showcasing their coproduct properties and universal verification.
Invariant DefinitionsExplores invariant definitions in sets, groups, and automorphisms, including p-divisible groups and free abelian groups.
Linear Molecules: CarbonCovers the properties of linear molecules in carbon and discusses neutral elements, associative law, and conjugate elements.