Finite Abelian Groups & RingsExplores the classification of finite abelian groups and rings, emphasizing elementary divisors and properties of rings.
Invariant DefinitionsExplores invariant definitions in sets, groups, and automorphisms, including p-divisible groups and free abelian groups.
Torsion and DivisibilityExplores torsion and divisibility in abelian groups, including p-divisible groups and their contrast with torsion elements.