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Definitions and Facts

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Book cover Blocks of Finite Groups and Their Invariants

Part of the book series: Lecture Notes in Mathematics ((LNM,volume 2127))

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Abstract

The chapter introduces the basic notions of representation theory of finite groups. In particular in contains definitions of p-modular systems, blocks of groups algebras, (lower) defect groups, the Brauer homomorphism, decomposition numbers, subsections, and fusion systems. Moreover, we present Brauer’s three main theorems as well as a few other important results. Most theorems are given without proof.

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References

  1. Alperin, J.L., Broué, M.: Local methods in block theory. Ann. Math. (2) 110(1), 143–157 (1979)

    Google Scholar 

  2. Aschbacher, M., Kessar, R., Oliver, B.: Fusion Systems in Algebra and Topology. London Mathematical Society Lecture Note Series, vol. 391. Cambridge University Press, Cambridge (2011)

    Google Scholar 

  3. Brauer, R.: On blocks and sections in finite groups. II. Am. J. Math. 90, 895–925 (1968)

    Article  MathSciNet  Google Scholar 

  4. Brauer, R.: Defect groups in the theory of representations of finite groups. Ill. J. Math. 13, 53–73 (1969)

    MATH  MathSciNet  Google Scholar 

  5. Brauer, R., Nesbitt, C.: On the modular characters of groups. Ann. Math. (2) 42, 556–590 (1941)

    Google Scholar 

  6. Broué, M.: On characters of height zero. In: The Santa Cruz Conference on Finite Groups (University of California, Santa Cruz, CA, 1979), Proceedings of the Symposium on Pure Mathematics, vol. 37, pp. 393–396. American Mathematical Society, Providence (1980)

    Google Scholar 

  7. Broué, M., Olsson, J.B.: Subpair multiplicities in finite groups. J. Reine Angew. Math. 371, 125–143 (1986)

    MATH  MathSciNet  Google Scholar 

  8. Conlon, S.B.: Twisted group algebras and their representations. J. Aust. Math. Soc. 4, 152–173 (1964)

    Article  MATH  MathSciNet  Google Scholar 

  9. Craven, D.A.: The Theory of Fusion Systems. Cambridge Studies in Advanced Mathematics, vol. 131. Cambridge University Press, Cambridge (2011). An algebraic approach

    Google Scholar 

  10. Feit, W.: The Representation Theory of Finite Groups. North-Holland Mathematical Library, vol. 25. North-Holland Publishing, Amsterdam (1982)

    Google Scholar 

  11. Fujii, M.: On determinants of Cartan matrices of p-blocks. Proc. Jpn. Acad. Ser. A Math. Sci. 56(8), 401–403 (1980)

    Article  MATH  Google Scholar 

  12. Karpilovsky, G.: The Schur Multiplier. London Mathematical Society Monographs. New Series, vol. 2. The Clarendon Press Oxford University Press, New York (1987)

    Google Scholar 

  13. Kessar, R., Linckelmann, M., Navarro, G.: A characterisation of nilpotent blocks (2014). arXiv:1402.5871v1

  14. Külshammer, B.: Crossed products and blocks with normal defect groups. Commun. Algebra 13(1), 147–168 (1985)

    Article  MATH  Google Scholar 

  15. Külshammer, B., Okuyama, T.: On centrally controlled blocks of finite groups. (unpublished)

    Google Scholar 

  16. Landrock, P.: On the number of irreducible characters in a 2-block. J. Algebra 68(2), 426–442 (1981)

    Article  MATH  MathSciNet  Google Scholar 

  17. Linckelmann, M.: Introduction to fusion systems. In: Group Representation Theory, pp. 79–113. EPFL Press, Lausanne (2007). Revised version: http://web.mat.bham.ac.uk/C.W.Parker/Fusion/fusion-intro.pdf

  18. Murai, M.: On subsections of blocks and Brauer pairs. Osaka J. Math. 37(3), 719–733 (2000)

    MATH  MathSciNet  Google Scholar 

  19. Nagao, H., Tsushima, Y.: Representations of finite groups. Academic, Boston (1989). Translated from the Japanese

    MATH  Google Scholar 

  20. Neukirch, J.: Algebraische Zahlentheorie. Springer, Berlin (1992)

    Book  MATH  Google Scholar 

  21. Olsson, J.B.: Lower defect groups. Commun. Algebra 8(3), 261–288 (1980)

    Article  MATH  MathSciNet  Google Scholar 

  22. Olsson, J.B.: Inequalities for block-theoretic invariants. In: Representations of Algebras (Puebla, 1980). Lecture Notes in Mathematics, vol. 903, pp. 270–284. Springer, Berlin (1981)

    Google Scholar 

  23. Olsson, J.B.: On subpairs and modular representation theory. J. Algebra 76(1), 261–279 (1982)

    Article  MATH  MathSciNet  Google Scholar 

  24. Puig, L.: Nilpotent blocks and their source algebras. Invent. Math. 93(1), 77–116 (1988)

    Article  MATH  MathSciNet  Google Scholar 

  25. Puig, L.: Pointed groups and construction of modules. J. Algebra 116(1), 7–129 (1988)

    Article  MATH  MathSciNet  Google Scholar 

  26. Puig, L.: The hyperfocal subalgebra of a block. Invent. Math. 141(2), 365–397 (2000)

    Article  MATH  MathSciNet  Google Scholar 

  27. Puig, L.: Frobenius Categories Versus Brauer Blocks. Progress in Mathematics, vol. 274. Birkhäuser Verlag, Basel (2009). The Grothendieck group of the Frobenius category of a Brauer block

    Google Scholar 

  28. Robinson, G.R.: Large character heights, Qd(p), and the ordinary weight conjecture. J. Algebra 319(2), 657–679 (2008)

    Article  MATH  MathSciNet  Google Scholar 

  29. Robinson, G.R.: On the focal defect group of a block, characters of height zero, and lower defect group multiplicities. J. Algebra 320(6), 2624–2628 (2008)

    Article  MATH  MathSciNet  Google Scholar 

  30. Watanabe, A.: p-Blocks and p-regular classes in a finite group. Kumamoto J. Sci. (Math.) 15(1), 33–38 (1982)

    Google Scholar 

  31. Watanabe, A.: Notes on p-blocks of characters of finite groups. J. Algebra 136(1), 109–116 (1991)

    Article  MATH  MathSciNet  Google Scholar 

  32. Watanabe, A.: The number of irreducible brauer characters in a p-block of a finite group with cyclic hyperfocal subgroup. J. Algebra 416, 167–183 (2014)

    Article  MATH  MathSciNet  Google Scholar 

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Sambale, B. (2014). Definitions and Facts. In: Blocks of Finite Groups and Their Invariants. Lecture Notes in Mathematics, vol 2127. Springer, Cham. https://doi.org/10.1007/978-3-319-12006-5_1

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