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The description for this book, Ramification Theoretic Methods in Algebraic Geometry (AM-43), Volume 43, will be forthcoming.

Algebraic fields. --- Geometry, Algebraic. --- Abelian group. --- Abstract algebra. --- Additive group. --- Affine variety. --- Algebraic closure. --- Algebraic curve. --- Algebraic equation. --- Algebraic function field. --- Algebraic function. --- Algebraic geometry. --- Algebraic number theory. --- Algebraic surface. --- Algebraic variety. --- Big O notation. --- Birational geometry. --- Branch point. --- Cardinal number. --- Cardinality. --- Complex number. --- Degrees of freedom (statistics). --- Dimension. --- Equation. --- Equivalence class. --- Existential quantification. --- Field extension. --- Field of fractions. --- Foundations of Algebraic Geometry. --- Function field. --- Galois group. --- Generic point. --- Ground field. --- Homomorphism. --- Ideal theory. --- Integer. --- Irrational number. --- Irreducible component. --- Linear algebra. --- Local ring. --- Mathematics. --- Max Noether. --- Maximal element. --- Maximal ideal. --- Natural number. --- Nilpotent. --- Noetherian ring. --- Null set. --- Order by. --- Order type. --- Parameter. --- Primary ideal. --- Prime ideal. --- Prime number. --- Projective variety. --- Quantity. --- Quotient ring. --- Ramification group. --- Rational function. --- Rational number. --- Real number. --- Resolution of singularities. --- Riemann surface. --- Ring (mathematics). --- Special case. --- Splitting field. --- Subgroup. --- Subset. --- Theorem. --- Theory of equations. --- Transcendence degree. --- Two-dimensional space. --- Uniformization. --- Valuation ring. --- Variable (mathematics). --- Vector space. --- Zero divisor. --- Zorn's lemma.

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This book studies the interplay between the geometry and topology of locally symmetric spaces, and the arithmetic aspects of the special values of L-functions.The authors study the cohomology of locally symmetric spaces for GL(N) where the cohomology groups are with coefficients in a local system attached to a finite-dimensional algebraic representation of GL(N). The image of the global cohomology in the cohomology of the Borel-Serre boundary is called Eisenstein cohomology, since at a transcendental level the cohomology classes may be described in terms of Eisenstein series and induced representations. However, because the groups are sheaf-theoretically defined, one can control their rationality and even integrality properties. A celebrated theorem by Langlands describes the constant term of an Eisenstein series in terms of automorphic L-functions. A cohomological interpretation of this theorem in terms of maps in Eisenstein cohomology allows the authors to study the rationality properties of the special values of Rankin-Selberg L-functions for GL(n) x GL(m), where n + m = N. The authors carry through the entire program with an eye toward generalizations.This book should be of interest to advanced graduate students and researchers interested in number theory, automorphic forms, representation theory, and the cohomology of arithmetic groups.

Shimura varieties. --- Cohomology operations. --- Number theory. --- Arithmetic groups. --- L-functions. --- Functions, L --- -Number theory --- Group theory --- Number study --- Numbers, Theory of --- Algebra --- Operations (Algebraic topology) --- Algebraic topology --- Varieties, Shimura --- Arithmetical algebraic geometry --- Addition. --- Adele ring. --- Algebraic group. --- Algebraic number theory. --- Arithmetic group. --- Automorphic form. --- Base change. --- Basis (linear algebra). --- Bearing (navigation). --- Borel subgroup. --- Calculation. --- Category of groups. --- Coefficient. --- Cohomology. --- Combination. --- Commutative ring. --- Compact group. --- Computation. --- Conjecture. --- Constant term. --- Corollary. --- Covering space. --- Critical value. --- Diagram (category theory). --- Dimension. --- Dirichlet character. --- Discrete series representation. --- Discrete spectrum. --- Eigenvalues and eigenvectors. --- Eisenstein series. --- Elaboration. --- Embedding. --- Euler product. --- Field extension. --- Field of fractions. --- Free module. --- Freydoon Shahidi. --- Function field. --- Functor. --- Galois group. --- Ground field. --- Group (mathematics). --- Group scheme. --- Harish-Chandra. --- Hecke L-function. --- Hecke character. --- Hecke operator. --- Hereditary property. --- Induced representation. --- Irreducible representation. --- K0. --- L-function. --- Langlands dual group. --- Level structure. --- Lie algebra cohomology. --- Lie algebra. --- Lie group. --- Linear combination. --- Linear map. --- Local system. --- Maximal torus. --- Modular form. --- Modular symbol. --- Module (mathematics). --- Monograph. --- N0. --- National Science Foundation. --- Natural number. --- Natural transformation. --- Nilradical. --- Permutation. --- Prime number. --- Quantity. --- Rational number. --- Reductive group. --- Requirement. --- Ring of integers. --- Root of unity. --- SL2(R). --- Scalar (physics). --- Sheaf (mathematics). --- Special case. --- Spectral sequence. --- Standard L-function. --- Subgroup. --- Subset. --- Summation. --- Tensor product. --- Theorem. --- Theory. --- Triangular matrix. --- Triviality (mathematics). --- Two-dimensional space. --- Unitary group. --- Vector space. --- W0. --- Weyl group.

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This work gives a full description of a method for analyzing the admissible complex representations of the general linear group G = Gl(N,F) of a non-Archimedean local field F in terms of the structure of these representations when they are restricted to certain compact open subgroups of G. The authors define a family of representations of these compact open subgroups, which they call simple types. The first example of a simple type, the "trivial type," is the trivial character of an Iwahori subgroup of G. The irreducible representations of G containing the trivial simple type are classified by the simple modules over a classical affine Hecke algebra. Via an isomorphism of Hecke algebras, this classification is transferred to the irreducible representations of G containing a given simple type. This leads to a complete classification of the irreduc-ible smooth representations of G, including an explicit description of the supercuspidal representations as induced representations. A special feature of this work is its virtually complete reliance on algebraic methods of a ring-theoretic kind. A full and accessible account of these methods is given here.

Representations of groups. --- Nonstandard mathematical analysis. --- Abelian group. --- Abuse of notation. --- Additive group. --- Affine Hecke algebra. --- Algebra homomorphism. --- Approximation. --- Automorphism. --- Bijection. --- Block matrix. --- Calculation. --- Cardinality. --- Classical group. --- Computation. --- Conjecture. --- Conjugacy class. --- Contradiction. --- Corollary. --- Coset. --- Critical exponent. --- Diagonal matrix. --- Dimension (vector space). --- Dimension. --- Discrete series representation. --- Discrete valuation ring. --- Divisor. --- Eigenvalues and eigenvectors. --- Equivalence class. --- Exact sequence. --- Exactness. --- Existential quantification. --- Explicit formula. --- Explicit formulae (L-function). --- Field extension. --- Finite group. --- Functor. --- Gauss sum. --- General linear group. --- Group theory. --- Haar measure. --- Harmonic analysis. --- Hecke algebra. --- Homomorphism. --- Identity matrix. --- Induced representation. --- Integer. --- Irreducible representation. --- Isomorphism class. --- Iwahori subgroup. --- Jordan normal form. --- Levi decomposition. --- Local Langlands conjectures. --- Local field. --- Locally compact group. --- Mathematics. --- Matrix coefficient. --- Maximal compact subgroup. --- Maximal ideal. --- Multiset. --- Normal subgroup. --- P-adic number. --- Permutation matrix. --- Polynomial. --- Profinite group. --- Quantity. --- Rational number. --- Reductive group. --- Representation theory. --- Requirement. --- Residue field. --- Ring (mathematics). --- Scientific notation. --- Simple module. --- Special case. --- Sub"ient. --- Subgroup. --- Subset. --- Support (mathematics). --- Symmetric group. --- Tensor product. --- Terminology. --- Theorem. --- Topological group. --- Topology. --- Vector space. --- Weil group. --- Weyl group.

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A general principle, discovered by Robert Langlands and named by him the "functoriality principle," predicts relations between automorphic forms on arithmetic subgroups of different reductive groups. Langlands functoriality relates the eigenvalues of Hecke operators acting on the automorphic forms on two groups (or the local factors of the "automorphic representations" generated by them). In the few instances where such relations have been probed, they have led to deep arithmetic consequences. This book studies one of the simplest general problems in the theory, that of relating automorphic forms on arithmetic subgroups of GL(n,E) and GL(n,F) when E/F is a cyclic extension of number fields. (This is known as the base change problem for GL(n).) The problem is attacked and solved by means of the trace formula. The book relies on deep and technical results obtained by several authors during the last twenty years. It could not serve as an introduction to them, but, by giving complete references to the published literature, the authors have made the work useful to a reader who does not know all the aspects of the theory of automorphic forms.

511.33 --- Analytical and multiplicative number theory. Asymptotics. Sieves etc. --- 511.33 Analytical and multiplicative number theory. Asymptotics. Sieves etc. --- Automorfe vormen --- Automorphic forms --- Formes automorphes --- Representation des groupes --- Representations of groups --- Trace formulas --- Vertegenwoordiging van groepen --- Formulas, Trace --- Discontinuous groups --- Group representation (Mathematics) --- Groups, Representation theory of --- Group theory --- Automorphic functions --- Forms (Mathematics) --- Analytical and multiplicative number theory. Asymptotics. Sieves etc --- Representations of groups. --- Trace formulas. --- Automorphic forms. --- 0E. --- Addition. --- Admissible representation. --- Algebraic group. --- Algebraic number field. --- Approximation. --- Archimedean property. --- Automorphic form. --- Automorphism. --- Base change. --- Big O notation. --- Binomial coefficient. --- Canonical map. --- Cartan subalgebra. --- Cartan subgroup. --- Central simple algebra. --- Characteristic polynomial. --- Closure (mathematics). --- Combination. --- Computation. --- Conjecture. --- Conjugacy class. --- Connected component (graph theory). --- Continuous function. --- Contradiction. --- Corollary. --- Counting. --- Coxeter element. --- Cusp form. --- Cyclic permutation. --- Dense set. --- Density theorem. --- Determinant. --- Diagram (category theory). --- Discrete series representation. --- Discrete spectrum. --- Division algebra. --- Eigenvalues and eigenvectors. --- Eisenstein series. --- Exact sequence. --- Existential quantification. --- Field extension. --- Finite group. --- Finite set. --- Fourier transform. --- Functor. --- Fundamental lemma (Langlands program). --- Galois extension. --- Galois group. --- Global field. --- Grothendieck group. --- Group representation. --- Haar measure. --- Harmonic analysis. --- Hecke algebra. --- Hilbert's Theorem 90. --- Identity component. --- Induced representation. --- Infinite product. --- Infinitesimal character. --- Invariant measure. --- Irreducibility (mathematics). --- Irreducible representation. --- L-function. --- Langlands classification. --- Laurent series. --- Lie algebra. --- Lie group. --- Linear algebraic group. --- Local field. --- Mathematical induction. --- Maximal compact subgroup. --- Multiplicative group. --- Nilpotent group. --- Orbital integral. --- P-adic number. --- Paley–Wiener theorem. --- Parameter. --- Parametrization. --- Permutation. --- Poisson summation formula. --- Real number. --- Reciprocal lattice. --- Reductive group. --- Root of unity. --- Scientific notation. --- Semidirect product. --- Special case. --- Spherical harmonics. --- Subgroup. --- Subset. --- Summation. --- Support (mathematics). --- Tensor product. --- Theorem. --- Trace formula. --- Unitary representation. --- Weil group. --- Weyl group. --- Zero of a function.