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The aim of this book is to unite the seemingly disparate topics of Clifford algebras, analysis on manifolds, and harmonic analysis. The authors show how algebra, geometry, and differential equations play a more fundamental role in Euclidean Fourier analysis. They then link their presentation of the Euclidean theory naturally to the representation theory of semi-simple Lie groups.
Algebra --- Harmonic analysis. Fourier analysis --- Clifford algebras. --- Dirac equation. --- Harmonic analysis --- Harmonic analysis.
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Harmonic analysis --- Fourier, Analyse de --- Analyse harmonique
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Harmonic analysis. Fourier analysis --- Harmonic analysis --- 51 --- Analysis (Mathematics) --- Functions, Potential --- Potential functions --- Banach algebras --- Calculus --- Mathematical analysis --- Mathematics --- Bessel functions --- Fourier series --- Harmonic functions --- Time-series analysis --- 51 Mathematics --- Congresses --- Harmonic analysis - Congresses.
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Group theory --- Analytical spaces --- Linear topological spaces. --- Locally compact groups. --- Harmonic analysis --- 51 --- Mathematics --- 51 Mathematics --- Linear topological spaces --- Locally compact groups --- Topological linear spaces --- Topological vector spaces --- Vector topology --- Topology --- Vector spaces --- Analysis (Mathematics) --- Functions, Potential --- Potential functions --- Banach algebras --- Calculus --- Mathematical analysis --- Bessel functions --- Fourier series --- Harmonic functions --- Time-series analysis --- Compact groups --- Topological groups --- Harmonic analysis.
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This book is concerned with the theory of unbounded derivations in C*-algebras, a subject whose study was motivated by questions in quantum physics and statistical mechanics, and to which the author has made a considerable contribution. This is an active area of research, and one of the most ambitious aims of the theory is to develop quantum statistical mechanics within the framework of the C*-theory. The presentation, which is based on lectures given in Newcastle upon Tyne and Copenhagen, concentrates on topics involving quantum statistical mechanics and differentiations on manifolds. One of the goals is to formulate the absence theorem of phase transitions in its most general form within the C* setting. For the first time, he globally constructs, within that setting, derivations for a fairly wide class of interacting models, and presents a new axiomatic treatment of the construction of time evolutions and KMS states.
C*-algebras. --- Differentiable dynamical systems. --- Harmonic analysis. --- Operator theory. --- Functional analysis --- Analysis (Mathematics) --- Functions, Potential --- Potential functions --- Banach algebras --- Calculus --- Mathematical analysis --- Mathematics --- Bessel functions --- Fourier series --- Harmonic functions --- Time-series analysis --- Differential dynamical systems --- Dynamical systems, Differentiable --- Dynamics, Differentiable --- Differential equations --- Global analysis (Mathematics) --- Topological dynamics --- Algebras, C star --- Algebras, W star --- C star algebras --- W star algebras --- W*-algebras --- Harmonic analysis
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These notes treat in full detail the theory of representations of the group of automorphisms of a homogeneous tree. The unitary irreducible representations are classified in three types: a continuous series of spherical representations; two special representations; and a countable series of cuspidal representations as defined by G.I. Ol'shiankii. Several notable subgroups of the full automorphism group are also considered. The theory of spherical functions as eigenvalues of a Laplace (or Hecke) operator on the tree is used to introduce spherical representations and their restrictions to discrete subgroups. This will be an excellent companion for all researchers into harmonic analysis or representation theory.
Trees (Graph theory) --- Graph theory --- Automorphisms. --- Harmonic analysis. --- Representations of groups. --- Group representation (Mathematics) --- Groups, Representation theory of --- Group theory --- Analysis (Mathematics) --- Functions, Potential --- Potential functions --- Banach algebras --- Calculus --- Mathematical analysis --- Mathematics --- Bessel functions --- Fourier series --- Harmonic functions --- Time-series analysis --- Symmetry (Mathematics) --- Automorphisms --- Harmonic analysis --- Representations of groups --- Arbres (Théorie des graphes) --- Analyse harmonique --- Représentations de groupes
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