Adolf Mader (University of Hawaiʻi)

April 21, 2020 @ 6:00 am – 8:00 am
Lecture held in Elysium

Title: Pontryagin Duals of Type Subgroups of Finite Rank Torsion-Free Abelian Groups
by Adolf Mader (University of Hawaiʻi) as part of Topological Groups

Lecture held in Elysium.

Pontryagin duals of type subgroups of finite rank torsion-free abelian groups are presented. The interplay between the intrinsic study of compact abelian groups, respectively torsion-free abelian groups, is discussed (how can researchers better leverage the published results in each setting so there is a dual impact?). A result definitively qualifying, in the torsion-free category, the uniqueness of decompositions involving maximal rank completely decomposable summands is given; the formulation of the result in the setting of protori is shown to optimally generalize a well-known result regarding the splitting of maximal tori from finite-dimensional protori.