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The Cartan Method

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

Abstract

We present some important general methods which allow to bound the number of characters in a given block of a finite group provided local information is available. Most results are stated in terms of Cartan invariants of subsections. We also provide a practical algorithm for computing Cartan invariants up to basic sets. This algorithm will be used in the following chapters.

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References

  1. Bertels, J.: Blöcke mit der 2-sylowgruppe von PSU(3, 4) als defektgruppe. Diplomarbeit, Jena (2012)

    Google Scholar 

  2. Brandt, J.: A lower bound for the number of irreducible characters in a block. J. Algebra 74(2), 509–515 (1982)

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

    Google Scholar 

  5. Héthelyi, L., Külshammer, B., Sambale, B.: A note on olsson’s conjecture. J. Algebra 398, 364–385 (2014)

    Article  MATH  MathSciNet  Google Scholar 

  6. Külshammer, B., Wada, T.: Some inequalities between invariants of blocks. Arch. Math. (Basel) 79(2), 81–86 (2002)

    Google Scholar 

  7. Liebeck, H.: The location of the minimum of a positive definite integral quadratic form. J. Lond. Math. Soc. (2) 3, 477–484 (1971)

    Google Scholar 

  8. Olsson, J.B.: On 2-blocks with quaternion and quasidihedral defect groups. J. Algebra 36(2), 212–241 (1975)

    Article  MATH  MathSciNet  Google Scholar 

  9. 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 

  10. Robinson, G.R.: On the number of characters in a block and the Brauer-Feit matrix (unpublished)

    Google Scholar 

  11. Robinson, G.R.: On the number of characters in a block. J. Algebra 138(2), 515–521 (1991)

    Article  MATH  MathSciNet  Google Scholar 

  12. Robinson, G.R.: On Brauer’s k(B) problem. J. Algebra 147(2), 450–455 (1992)

    Article  MATH  MathSciNet  Google Scholar 

  13. Sambale, B.: 2-blöcke mit metazyklischen und minimal nichtabelschen defektgruppen. Dissertation, Südwestdeutscher Verlag für Hochschulschriften, Saarbrücken (2011)

    Google Scholar 

  14. Sambale, B.: Further evidence for conjectures in block theory. Algebra Number Theory 7(9), 2241–2273 (2013)

    Article  MATH  MathSciNet  Google Scholar 

  15. The GAP Group: GAP – Groups, Algorithms, and Programming, Version 4.6.5 (2013). http://www.gap-system.org

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Sambale, B. (2014). The Cartan Method. 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_4

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