Nolan Russell Wallach (born August 3, 1940) is a mathematician known for work in the representation theory of reductive algebraic groups. He is the author of the two-volume treatise Real Reductive Groups.[1]
Wallach was a Sloan Fellow from 1972 to 1974. In 1978 he was an Invited Speaker with talk The spectrum of compact quotients of semisimple Lie groups[4] at the International Congress of Mathematicians in Helsinki. He was elected in 2004 a Fellow of the American Academy of Arts and Sciences and in 2012 a Fellow of the American Mathematical Society.[2][5] His doctoral students include AMS Fellow Alvany Rocha.[3] He has supervised more than 18 Ph.D. theses.[3] Besides representation theory, Wallach has also published more than 150 papers in the fields of algebraic geometry, combinatorics, differential equations, harmonic analysis, number theory, quantum information theory, Riemannian geometry, and ring theory.[6]
with S. Aloff: An infinite number of distinct 7-manifolds admitting positively curved Riemannian structures, Bull. Amer. Math. Soc., vol. 81, 1975, pp. 93–97 MR0370624doi:10.1090/S0002-9904-1975-13649-4
with D. DeGeorge: Limit formulas for multiplicities in L2(Γ\G), Annals of Mathematics, vol. 107, 1978, pp. 133–150. doi:10.2307/1971140
with A. Rocha-Caridi: Characters of irreducible representations of the Lie algebra of vector fields on the circle, Invent. Math., vol. 72, 1983, pp. 57–75 doi:10.1007/BF01389129
with A. Rocha-Caridi: Highest weight modules over graded Lie algebras: resolutions, filtrations and character formulas, Transactions of the American Mathematical Society, vol. 277, 1983, pp. 133–162 MR690045doi:10.1090/S0002-9947-1983-0690045-3
with T. Enright, R. Howe: A classification of unitary highest weight modules, in: Representation theory of reductive groups (Park City, Utah 1982), Progress in Mathematics 40, Birkhäuser 1983, pp. 97–143 doi:10.1007/978-1-4684-6730-7_7
Invariant differential operators on a reductive Lie algebra and Weyl group representations, J. Amer. Math. Soc., vol. 6, no. 4, 1993, pp. 779–816. doi:10.2307/2152740
Quantum computing and entanglement for mathematicians, in: Representation theory and complex analysis, pp. 345–376, Lecture Notes in Math. No. 1931, Springer 2008 doi:10.1007/978-3-540-76892-0_6
with G. Gour: Classification of multipartite entanglement of all finite dimensionality, Phys. Rev. Lett., vol. 111, 2013, 060502 doi:10.1103/PhysRevLett.111.060502
Books
Harmonic analysis on homogeneous spaces, New York: Marcel Dekker 1973
Symplectic geometry and Fourier analysis, Brookline: Math. Science Press 1977[7]
Real Reductive Groups, 2 vols., Academic Press 1988,[8] 1992[9]
with Roe Goodman: Representations and invariants of the classical groups, Cambridge University Press 1998;[10] 1st pbk edition, 1999; reprint with corrections, 2003
with Armand Borel: Continuous cohomology, discrete subgroups and representations of reductive groups, Annals of Mathematical Studies 94, 1980, 2nd edition, American Mathematical Society 2013