Wei Zhou
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 Aug 1 awarded Popular Question Aug 1 awarded Yearling Aug 1 comment About unpublished lecture notes of Philip Hall It's great! I can't believe that I see these notes finally. Thank you very much! Sep 24 awarded Autobiographer Jul 2 awarded Curious May 23 comment Does a finite simple group of order divisible by $60$ have $A_{5}$ as a subgroup? @DerekHolt Yes, it is not sufficient. I forget the condition 60 divives the order of the groups. May 23 comment Does a finite simple group of order divisible by $60$ have $A_{5}$ as a subgroup? I found this paper: Michael J. J. Barry and Michael B. Ward, SIMPLE GROUPS CONTAIN MINIMAL SIMPLE GROUPS, Publicacions Matem`atiques, Vol 41 (1997), 411–415. By the answer of professor Derek Holt, only Suzuki group left. May 23 comment Does a finite simple group of order divisible by $60$ have $A_{5}$ as a subgroup? I remember a paper proved that each non abelian simple group contains a minimal simple group as a subgroup. So we need to check minimal simple groups. May 29 comment about the non-solvable group of order $120$ Thank you very much for the inspiring answer. May 13 comment about the non-solvable group of order $120$ Thank you very much, Prof. Holt. May 13 accepted about the non-solvable group of order $120$ May 13 asked about the non-solvable group of order $120$ Mar 25 awarded Critic Mar 11 awarded Yearling Feb 24 comment Quotients of Abelian Groups The only case that need to be considered is that $C=1$. And now the equation is $D/(A+B) \cong A \cap B$. In general, this is not true. So there need some additional restrictions. Jan 12 comment The number of elements of order k in PGL(2, q) @Mart: Sorry I have no reference on PGL at hand. But I think $1/2$ come from $|G:N_G(C)|$. Jan 12 answered The number of elements of order k in PGL(2, q) Jan 2 answered A question about minimal simple group Dec 19 comment Reference: Finite $p$-Groups @Prof. A. Mann. As you have given many beautiful results on $p$-groups, I fasciate your book on $p$-group. I am very glad even if I know the content of the few chapter you have written. Dec 19 comment Reference: Finite $p$-Groups I am also interested with the book by A Mann who do many contribution to p-groups.