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Journal of the American Mathematical Society

Published by the American Mathematical Society, the Journal of the American Mathematical Society (JAMS) is devoted to research articles of the highest quality in all areas of mathematics.

ISSN 1088-6834 (online) ISSN 0894-0347 (print)

The 2020 MCQ for Journal of the American Mathematical Society is 4.83.

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Parabolic transfer for real groups
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by James Arthur
J. Amer. Math. Soc. 21 (2008), 171-234
Published electronically: June 25, 2007


We shall establish an identity between distributions on different real reductive groups. The distributions arise from the trace formula. They represent the main archimedean terms in both the invariant and stable forms of the trace formula. The identity will be an essential part of the comparison of these formulas. As such, it is expected to lead to reciprocity laws among automorphic representations on different groups. Our techniques are analytic. We shall show that the difference of the two sides of the proposed identity is the solution of a homogeous boundary value problem. More precisely, we shall show that it satisfies a system of linear differential equations, that it obeys certain boundary conditions around the singular set, and that it is asymptotic to zero. We shall then show that any such solution vanishes.
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Bibliographic Information
  • James Arthur
  • Affiliation: Department of Mathematics, University of Toronto, Bahen Centre, 6th Floor, 40 St George Street, Toronto, ON M5S 2E4 Canada
  • Received by editor(s): December 21, 2005
  • Published electronically: June 25, 2007
  • Additional Notes: The author was supported in part by NSERC Operating Grant A3483.
  • © Copyright 2007 American Mathematical Society
  • Journal: J. Amer. Math. Soc. 21 (2008), 171-234
  • MSC (2000): Primary 22E30, 22E55
  • DOI:
  • MathSciNet review: 2350054