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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)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Characterizations of the Fischer groups. I, II, III
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by David Parrott PDF
Trans. Amer. Math. Soc. 265 (1981), 303-347 Request permission

Abstract:

B. Fischer, in his work on finite groups which contain a conjugacy class of $3$-transpositions, discovered three new sporadic finite simple groups, usually denoted $M(22)$, $M(23)$ and $M(24)โ€™$. In Part I two of these groups, $M(22)$ and $M(23)$, are characterized by the structure of the centralizer of a central involution. In addition, the simple groups ${U_6}(2)$ (often denoted by $M(21))$ and $P\Omega (7,3)$, both of which are closely connected with Fischerโ€™s groups, are characterized by the same method. The largest of the three Fischer groups $M(24)$ is not simple but contains a simple subgroup $M(24)โ€™$ of index two. In Part II we give a similar characterization by the centralizer of a central involution of $M(24)$ and also a partial characterization of the simple group $M(24)โ€™$. The purpose of Part III is to complete the characterization of $M(24)โ€™$ by showing that our abstract group $G$ is isomorphic to $M(24)โ€™$. We first prove that $G$ contains a subgroup $X \cong M(23)$ and then we construct a graph (on the cosets of $X$) which is shown to be isomorphic to the graph for $M(24)$.
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Additional Information
  • © Copyright 1981 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 265 (1981), 303-347
  • MSC: Primary 20D05
  • DOI: https://doi.org/10.1090/S0002-9947-1981-0610952-5
  • MathSciNet review: 610952