Broué's abelian defect group conjecture holds for the Harada-Norton sporadic simple group $HN$

Details Broué's abelian defect group conjecture holds for the Harada-Norton sporadic simple group $HN$ Broué's abelian defect group conjecture holds for the Harada-Norton sporadic simple group $HN$

2009-06-28

arxiv.org/abs/0906.5124v1

Mathematics

Representation Theory

36 pages

Scientific paper

In representation theory of finite groups, there is a well-known and important conjecture due to M. Brou\'e. He conjectures that, for any prime $p$, if a $p$-block $A$ of a finite group $G$ has an abelian defect group $P$, then $A$ and its Brauer corresponding block $B$ of the normaliser $N_G(P)$ of $P$ in $G$ are derived equivalent (Rickard equivalent). This conjecture is called Brou\'e's abelian defect group conjecture. We prove in this paper that Brou\'e's abelian defect group conjecture is true for a non-principal 3-block $A$ with an elementary abelian defect group $P$ of order 9 of the Harada-Norton simple group $HN$. It then turns out that Brou\'e's abelian defect group conjecture holds for all primes $p$ and for all $p$-blocks of the Harada-Norton simple group $HN$.

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