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|{{CDD|node_c2|3|node_c2|4|node_c3|3|node_c2}} || {{CDD|node_c2|4|node_c3|3|node_c2}} || {{CDD|node_c2|6|node_c3}} ||6||B<sub>3</sub>
|{{CDD|node_c2|3|node_c2|4|node_c3|3|node_c2}} || {{CDD|node_c2|4|node_c3|3|node_c2}} || {{CDD|node_c2|6|node_c3}} ||6||B<sub>3</sub>
|- align=center BGCOLOR="#e0e0ff"
|- align=center BGCOLOR="#e0e0ff"
|{{CDD|node_c2|3|node_c2|4|node_c2|3|node_c3}} || || {{CDD|node_c2|3|node_c3}} ||3×2||A<sub>2</sub>
|{{CDD|node_c2|3|node_c2|4|node_c2|3|node_c3}} || || {{CDD|node_c2|6|node_c3}} ||3×2||A<sub>2</sub>
|- align=center
|- align=center
|{{CDD|node_c2|3|node_c2|4|node_c2|3|node_c2}} || || {{CDD|node_c2}} || 2||A<sub>1</sub>
|{{CDD|node_c2|3|node_c2|4|node_c2|3|node_c2}} || || {{CDD|node_c2}} || 2||A<sub>1</sub>
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|{{CDD|node_c2|5|node_c3|3|node_c3|3|node_c2}}<BR>{{CDD|node_c2|5|node_c3|3|node_c2|3|node_c2}} || {{CDD|node_c2|5|node_c3|3|node_c2}} || {{CDD|node_c2|10|node_c3}} ||10||H<sub>3</sub>
|{{CDD|node_c2|5|node_c3|3|node_c3|3|node_c2}}<BR>{{CDD|node_c2|5|node_c3|3|node_c2|3|node_c2}} || {{CDD|node_c2|5|node_c3|3|node_c2}} || {{CDD|node_c2|10|node_c3}} ||10||H<sub>3</sub>
|- align=center BGCOLOR="#e0e0ff"
|- align=center BGCOLOR="#e0e0ff"
|{{CDD|node_c2|5|node_c3|3|node_c3|3|node_c3}} || || {{CDD|node_c2|5|node_c3}} ||5×2||H<sub>2</sub>
|{{CDD|node_c2|5|node_c3|3|node_c3|3|node_c3}} || || {{CDD|node_c2|10|node_c3}} ||5×2||H<sub>2</sub>
|- align=center
|- align=center
|{{CDD|node_c2|5|node_c2|3|node_c3|3|node_c3}}<BR>{{CDD|node_c2|5|node_c2|3|node_c2|3|node_c3}} || || {{CDD|node_c2|3|node_c3}} ||3×2||A<sub>2</sub>
|{{CDD|node_c2|5|node_c2|3|node_c3|3|node_c3}}<BR>{{CDD|node_c2|5|node_c2|3|node_c2|3|node_c3}} || || {{CDD|node_c2|3|node_c3}} ||3×2||A<sub>2</sub>
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!colspan=3|Folding||Degree||Coxeter Plane
!colspan=3|Folding||Degree||Coxeter Plane
|- align=center
|- align=center
|{{CDD|node_c2|3|node_c3|split1|nodeab_c2|3ab|nodeab_c3}} || {{CDD|node_c2|3|node_c3|4|node_c2|3|node_c3}} ||{{CDD|node_c2|12|node_c3}} || 12||E<sub>6</sub>
|{{CDD|node_c2|3|node_c3|split1|nodeab_c2|3ab|nodeab_c3}} || {{CDD|node_c2|3|node_c3|4|node_c2|3|node_c3}} ||{{CDD|node_c2|12|node_c3}} || 12||E<sub>6</sub> = F<sub>4</sub>
|- align=center
|- align=center
| || ||{{CDD|node_c2|9|node_c3}} || 9||
| || ||{{CDD|node_c2|9|node_c3}} || 9||
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|- align=center BGCOLOR="#ffe0e0"
|- align=center BGCOLOR="#ffe0e0"
|{{CDD|node_c2|3|node_c3|split1|nodeab_c2-3|3ab|nodeab_c3-2}} || {{CDD|node_c3|3|node_c2|3|node_c3|split1|nodeab_c2}} = {{CDD|node_c3|3|node_c2|3|node_c3|4|node_c2}} ||{{CDD|node_c2|8|node_c3}} || 8||D<sub>5</sub> = B<sub>4</sub>
|{{CDD|node_c2|3|node_c3|split1|nodeab_c2-3|3ab|nodeab_c3-2}} || {{CDD|node_c3|3|node_c2|3|node_c3|split1|nodeab_c2}} = {{CDD|node_c3|3|node_c2|3|node_c3|4|node_c2}} ||{{CDD|node_c2|8|node_c3}} || 8||D<sub>5</sub> = B<sub>4</sub>
⚫
|- align=center BGCOLOR="#ffe0e0"
⚫
|{{CDD|node_c2|3|node_c2|split1|nodeab_c3-2|3ab|nodeab_c2}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c3|3ab|nodeab_c3}}<BR>{{CDD|node_c2|3|node_c3|split1|nodeab_c3|3ab|nodeab_c3-2}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c2|3ab|nodeab_c3}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c2-3|3ab|nodeab_c3}}<BR>{{CDD|node_c3|3|node_c2|split1|nodeab_c3-2|3ab|nodeab_c3-2}}
⚫
|| {{CDD|node_c2|split1|nodeab_c3}} || {{CDD|node_c2|8|node_c3}} || 4×2||A<sub>3</sub>


|- align=center BGCOLOR="#e0e0ff"
|- align=center BGCOLOR="#e0e0ff"
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|{{CDD|node_c2|3|node_c3|split1|nodeab_c3-2|3ab|nodeab_c3}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c3|3ab|nodeab_c3-2}} <BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c3-2|3ab|nodeab_c2-3}}
|{{CDD|node_c2|3|node_c3|split1|nodeab_c3-2|3ab|nodeab_c3}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c3|3ab|nodeab_c3-2}} <BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c3-2|3ab|nodeab_c2-3}}
||{{CDD|node_c2|3|node_c3|3|node_c2|3|node_c3}} ||{{CDD|node_c2|5|node_c3}} || 5||A<sub>4</sub>
||{{CDD|node_c2|3|node_c3|3|node_c2|3|node_c3}} ||{{CDD|node_c2|5|node_c3}} || 5||A<sub>4</sub>
⚫
|- align=center
⚫
|{{CDD|node_c2|3|node_c2|split1|nodeab_c3-2|3ab|nodeab_c2}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c3|3ab|nodeab_c3}}<BR>{{CDD|node_c2|3|node_c3|split1|nodeab_c3|3ab|nodeab_c3-2}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c2|3ab|nodeab_c3}}<BR>{{CDD|node_c2|3|node_c2|split1|nodeab_c2-3|3ab|nodeab_c3}}<BR>{{CDD|node_c3|3|node_c2|split1|nodeab_c3-2|3ab|nodeab_c3-2}}
⚫
|| {{CDD|node_c2|split1|nodeab_c3}} || {{CDD|node_c2|4|node_c3}} || 4||A<sub>3</sub>
|- align=center
|- align=center
|{{CDD|node_c2|3|node_c2|split1|nodeab_c2|3ab|nodeab_c2}}|| || {{CDD|node_c2}} || 2||A<sub>1</sub>
|{{CDD|node_c2|3|node_c2|split1|nodeab_c2|3ab|nodeab_c2}}|| || {{CDD|node_c2}} || 2||A<sub>1</sub>

Latest revision as of 02:20, 31 October 2017

Coxeter
group 		Coxeter
diagram 		Degrees Coxeter planes
A2 2, 3 A1, A2
B2 2, 4 A1, B2
H2 2, 5 A1, H2
A3 2, 3, 4 A1, A2, A3
B3 2, 4, 6 A1, B2, A2=B3
H3 2, 6, 10 A1, A2, H2=H3
A4 2, 3, 4, 5 A1, A2, A3, A4
B4 2, 4, 6, 8 A1, A3, B2, A2=B3, B4
D4 2, 4, 6 A1, A3, A2=D4
F4 2, 6, 8, 12 A1, A3=B2, A2=B3, F4
H4 2, 12, 20, 30 A1, A2, A3, H2=H3, H4
A5 2, 3, 4, 5, 6 A1, A2, A3, A4, A5
B5 2, 4, 6, 8, 10 A1, A3=B2, A2=B3, B4, A4=B5
D5 2, 4, 6, 8; 5 A1, A3, A2=D4, D5; A4
A6 2, 3, 4, 5, 6, 7 A1, A2, A3, A4, A5, A6
B6 2, 4, 6, 8, 10, 12 A1, A3=B2, A2=B3, B4, A4=B5, B6
D6 2, 4, 6, 8, 10
E6 2, 5, 6, 8, 9, 12 A1, A4, A2=D4=A5, A3=D5, ?, E6
E7 2, 6, 8, 10, 12, 14, 18
E8 2, 8, 12, 14, 18, 20, 24, 30
Finite Coxeter group foldings

Let me try using Coxeter–Dynkin_diagram#Geometric_foldings to express Coxeter planes as Coxeter numbers and all degrees of fundamental invariants. Foldings are shown by marking node with colors, re and blue, which map to node 1 or 2 in the rank 2 folded group.

A3

[edit]
Example: A3,
Folding Degree Coxeter Plane
4 A3
3 A2
2 A1

B3

[edit]
Example: B3,
Folding Degree Coxeter Plane
6 B3
3×2 A2
4 B2
2 A1

H3

[edit]
Example: H3,
Folding Degree Coxeter Plane
10 H3
5×2 H2
3×2 A2
2 A1

A4

[edit]
Example: A4,
Folding Degree Coxeter Plane
5 A4

4 A3

3 A2
2 A1

B4

[edit]
Example: B4,
Folding Degree Coxeter Plane
8 B4

6 B3

3×2 A2
4 A3
4 B2
2 A1

D4

[edit]
Example: D4,
Folding Degree Coxeter Plane
6 D4=B3
3×2 A2
= 4 D3=A3
4 B2
2 A1

F4

[edit]
Example: F4,
Folding Degree Coxeter Plane
12 F4
4×2 A3
4×2 B2
6 B3
3×2 A2
2 A1

H4

[edit]
Example: H4,
Folding Degree Coxeter Plane
30 H4
20
12 F4

10 H3
5×2 H2

3×2 A2
4 A3
2 A1

A5

[edit]
Example: A5,
Folding Degree Coxeter Plane
6 A5

5 A4



4 A3
3 A2
2 A1

B5

[edit]
Example: B5,
Folding Degree Coxeter Plane
10 B5
5×2 A4
8 B4


6 B3


3×2 A2


4 A3
4 B2
2 A1

D5

[edit]
Example: D5,
Folding Degree Coxeter Plane
8 D5=B4

= 6 D4=B3


3×2 A2
5 A4



= 4 D3=A3
2 A1

E6

[edit]
Example: E6,
Folding Degree Coxeter Plane
12 E6 = F4
9
= 8 D5 = B4
6 A5



= 6 D4 = B3


3×2 A2


5 A4





4 A3
2 A1
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