[過去ﾛｸﾞ] 現代数学の系譜 工学物理雑談 古典ガロア理論も読む78 (1002ﾚｽ)
上下前次1-新
抽出解除 ﾚｽ栞
このｽﾚｯﾄﾞは過去ﾛｸﾞ倉庫に格納されています｡
次ｽﾚ検索 歴削→次ｽﾚ 栞削→次ｽﾚ 過去ﾛｸﾞﾒﾆｭｰ
ﾘﾛｰﾄﾞ規制です｡10分ほどで解除するので､他のﾌﾞﾗｳｻﾞへ避難してください｡
18(3): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2019/10/19(土)19:25 ID:ti2BclkQ(1/18) AAS
S5の位数20の部分群
外部ﾘﾝｸ:groupprops.subwiki.org
General affine group:GA(1,5)
(抜粋)
As GA(1,q), q = 5: q(q - 1) = 5(5 - 1) = 20
As holomorph of cyclic group:Z5: |Z5||Aut(Z5)| = 5・4 = 20
As Sz(q), q = 2: q^2(q^2 + 1)(q - 1) = 2^2(2^2 + 1)(2 - 1) = 4・5・1 = 20
Group properties
Function Value
abelian group No
nilpotent group No
metacyclic group Yes
supersolvable group Yes
solvable group Yes
Frobenius group Yes
Camina group Yes
外部ﾘﾝｸ:people.maths.bris.ac.uk
Tim Dokchitser Arithmetic/Algebraic Geometry University of Bristol
外部ﾘﾝｸ[html]:people.maths.bris.ac.uk
G = F5? order 20 = 2^2・5 Frobenius group Tim Dokchitser
外部ﾘﾝｸ:groupprops.subwiki.org
General affine group of degree one
GA(1,K) = K semix K^*
外部ﾘﾝｸ:ja.wikipedia.org
アフィン群
外部ﾘﾝｸ:en.wikipedia.org
Frobenius group
(抜粋)
In mathematics, a Frobenius group is a transitive permutation group on a finite set, such that no non-trivial element fixes more than one point and some non-trivial element fixes a point. They are named after F. G. Frobenius.
Structure
A subgroup H of a Frobenius group G fixing a point of the set X is called the Frobenius complement.
The identity element together with all elements not in any conjugate of H form a normal subgroup called the Frobenius kernel K.
(This is a theorem due to Frobenius (1901); there is still no proof of this theorem that does not use character theory, although see [1].)
The Frobenius group G is the semidirect product of K and H:
G=K semix H
つづく
19(2): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2019/10/19(土)19:25 ID:ti2BclkQ(2/18) AAS
>>18
つづき
(スレ77 2chｽﾚ:math より)
外部ﾘﾝｸ[pdf]:www.isc.meiji.ac.jp
2008 年度卒業研究 S_3, S_4, S_5 の部分群の分類
(抜粋)
P3
S5の部分群
位数20： < (12345), (2354) > S5中の共役な群6個
外部ﾘﾝｸ[pdf]:www.isc.meiji.ac.jp
2004 年度卒業研究 位数 30 以下の群の分類
(抜粋)
P3
位数20 5個；
アーベル：C4 × C5, C2 × C2 × C5 ２個,
非アーベル： C5 semix C4, Q20, D20 ３個
P16
11 位数 20 の群の分類
外部ﾘﾝｸ:en.wikipedia.org
List of small groups
(抜粋)
List of small abelian groups
位数20
51 G202 Z20 = Z5 × Z4 Z10, Z5, Z4, Z2 GroupDiagramMiniC20.svg Cyclic. Product.
54 G205 Z10 × Z2 = Z5 × Z22 Z5, Z2 GroupDiagramMiniC2C10.png Product.
List of small non-abelian groups
位数20
50 G201 Q20 = Dic5 = <5,2,2> GroupDiagramMiniQ20.png Binary dihedral group
52 G203 Z5 semix Z4 GroupDiagramMiniC5semiprodC4.png Frobenius group
53 G204 Dih10 = Dih5 × Z2 = D20 GroupDiagramMiniD20.png Dihedral group, product
(引用終り)
以上
21(2): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2019/10/19(土)19:34 ID:ti2BclkQ(4/18) AAS
>>19 追加
＞非アーベル： C5 semix C4, Q20, D20 ３個
S5の位数20の部分群は、
非アーベル： C5 semix C4 （Ｃ5とＣ4の半直積）
（>>18より）
abelian group No
nilpotent group No
metacyclic group Yes
supersolvable group Yes
solvable group Yes
Frobenius group Yes
ということです
おっと、General affine group:GA(1,5) （線形群でもあります）
鈴木群 Sz(q), q = 2: q^2(q^2 + 1)(q - 1) = 2^2(2^2 + 1)(2 - 1) = 4・5・1 = 20 （>>18）
なんだって（＾＾；
58: 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2019/10/20(日)13:28 ID:f+LcfVi/(13/25) AAS
>>18
Terence TaoのFrobenius group追加
外部ﾘﾝｸ:terrytao.wordpress.com
What's new
Updates on my research and expository papers, discussion of open problems, and other maths-related topics. By Terence Tao
Tag Archive
You are currently browsing the tag archive for the ‘Frobenius groups’ tag.
The theorems of Frobenius and Suzuki on finite groups
12 April, 2013 in expository, math.GR, math.RT | Tags: CA groups, characters, classification of finite simple groups, Fourier transform, Frobenius groups, Frobenius theorem, induced representations, integrality gap, Suzuki theorem
略
3 June, 2013 at 1:03 pm
Terence Tao
Yes, this is something I would like to understand better myself.
One of the funny things coming out of Suzuki’s analysis is that to every (Weyl group conjugacy class of a) character \xi_{i,a} on a (conjugacy class of a) maximal abelian subgroup H_i of G there is associated an “exceptional character” \xi^*_{i,a} of G which is a component of the induced representation of G coming from the character of H_i (or sometimes, a bit weirdly,
it is an “anti-component”, if the sign \epsilon_i is negative), and略
27 June, 2013 at 12:19 pm
Terence Tao
The original reference is
G. Frobenius, “Ueber auflosbare Gruppen IV” Sitzungsber. Preuss. Akad. Wissenschaft. (1901) pp. 1216?1230
but it may be difficult to locate (see 外部ﾘﾝｸ:math.stackexchange.com for some related discussion). A somewhat more modern reference is
I.M. Isaacs, “Character theory of finite groups” , Acad. Press (1976)
上下前次1-新書関写板覧索設栞歴
ｽﾚ情報 赤ﾚｽ抽出 画像ﾚｽ抽出 歴の未読ｽﾚ
ぬこの手 ぬこTOP 0.050s