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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

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Derivations, isomorphisms, and second cohomology of generalized Witt algebras
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by Dragomir Ž. Đ Oković and Kaming Zhao PDF
Trans. Amer. Math. Soc. 350 (1998), 643-664 Request permission


Generalized Witt algebras, over a field $F$ of characteristic $0$, were defined by Kawamoto about 12 years ago. Using different notations from Kawamoto’s, we give an essentially equivalent definition of generalized Witt algebras $W=W(A,T,\varphi )$ over $F$, where the ingredients are an abelian group $A$, a vector space $T$ over $F$, and a map $\varphi :T\times A\to K$ which is linear in the first variable and additive in the second one. In this paper, the derivations of any generalized Witt algebra $W=$ $W(A,T,\varphi )$, with the right kernel of $\varphi$ being $0$, are explicitly described; the isomorphisms between any two simple generalized Witt algebras are completely determined; and the second cohomology group $H^2(W,F)$ for any simple generalized Witt algebra is computed. The derivations, the automorphisms and the second cohomology groups of some special generalized Witt algebras have been studied by several other authors as indicated in the references.
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Additional Information
  • Dragomir Ž. Đ Oković
  • Affiliation: Department of Pure Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
  • Email:
  • Kaming Zhao
  • Affiliation: Institute of Systems Science, Academia Sinica, Beijing, 100080, China
  • Address at time of publication: Department of Mathematics, University of Wisconsin, Madison, Wisconsin 53706-1388
  • Email:
  • Received by editor(s): January 2, 1996
  • Received by editor(s) in revised form: April 8, 1996
  • Additional Notes: The first author was supported in part by the NSERC Grant A-5285. The second author was supported by Academia Sinica of P.R. China.
  • © Copyright 1998 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 350 (1998), 643-664
  • MSC (1991): Primary 17B40, 17B65; Secondary 17B56, 17B68
  • DOI:
  • MathSciNet review: 1390977