Abelian groups 4 Locally compact Abelian groups 3 Fourier transformations 2 Harmonic analysis 2 Abelian Groups 1 Abstract harmonic analysis -- Instructional exposition (textbooks, tutorial papers, etc.) 1 Automorphisms 1 Banach spaces 1 Differentiable dynamical systems 1 Duality theory 1 Duality theory (Mathematics) 1 Ergodic theory 1 Factorization (Mathematics) 1 Factors (Algebra) 1 Functional analysis -- Instructional exposition (textbooks, tutorial papers, etc.) 1 Harmonic analysis on Euclidean spaces -- Instructional exposition (textbooks, tutorial papers, etc.) 1 Linear and multilinear algebra; matrix theory -- Instructional exposition (textbooks, tutorial papers, etc.) 1 Locally compact abelian groups 1 Mathematical analysis 1 Mathematics 1 Measure and integration -- Instructional exposition (textbooks, tutorial papers, etc.) 1 Probabilities 1 Probability measures 1 Real functions -- Instructional exposition (textbooks, tutorial papers, etc.) 1 Rigidity (Geometry) 1 Topological groups 1 Topological groups, Lie groups -- Locally compact abelian groups (LCA groups) -- General properties and structure of LCA groups 1