Type E
6. The element w = s
1s
3s
4s
3s
2s
4s
5s
6is 9-regular. If the order of q mod ℓ is 9, the characters of the principal ℓ-block in the cohomology of X(W ) are arranged in the following way:
i 8 9 10 11 12 13 14 15 16
H
ic(X(w ), Q
ℓ) St q
2φ
20,20q
3φ
64,13q
4φ
90,8q
5φ
64,4q
6φ
20,2q
8Id θq
4E
6[θ]
θ
2q
4E
6[θ
2]
The Brauer tree is
St φ
20,20φ
64,13φ
90,8φ
64,4φ
20,2Id
E
6[θ]
E
6[θ
2]
Type E
7. The element w = s
7s
6s
5s
4s
5s
2s
4s
3s
1is 14-regular. If the order of q mod ℓ is 14, the characters of the principal ℓ-block in the cohomology of X(W ) are arranged in the following way:
i 9 10 11 12 13 14 15 16 17 18
H
ic(X(w ), Q
ℓ) St q
2φ
27,37q
3φ
105,26q
4φ
189,17q
5φ
189,10q
6φ
105,5q
7φ
27,2q
9Id
− q
3D
4,ε2− q
4D
4,rε2− q
5D
4,rε1− q
6D
4,ε1iq
9/2E
7[i]
−iq
9/2E
7[−i]
The Brauer tree should be
1
2
St φ
27,37φ
105,26φ
189,17φ
189,10φ
105,5φ
27,2E
7[i]
E
7[−i]
Id D
4,ε1D
4,rε1D
4,rε2D
4,ε2Type E
8. The element w = s
8s
7s
6s
2s
4s
5s
3s
4s
1s
3is 24-regular. If the order of q mod ℓ is 24, the characters of the principal ℓ-block in the cohomology of X( W ) are arranged in the following way:
i 10 11 12 13 14 15 16 17 18 19 20
H
ic(X(w ), Q
ℓ) St q
2φ
35,74q
3φ
160,55q
4φ
350,38q
5φ
448,25q
6φ
350,14q
7φ
160,7q
8φ
35,2q
10Id
− q
3D
4,φ′′2,16
− q
4D
4,φ′′8,9
− q
5D
4,φ12,4− q
6D
4,φ′8,3
− q
7D
4,φ′ 2,4θq
4E
6[θ]
φ1,3θq
5E
6[θ]
φ2,2θq
6E
6[θ]
φ′′1,3θ
2q
4E
6[θ
2]
φ1,3θ
2q
5E
6[θ
2]
φ2,2θ
2q
6E
6[θ
2]
φ′′1,3iq
5E
8[i]
−iq
5E
8[−i]
− θq
5E
8[ − θ]
−θ
2q
5E
8[−θ
2]
The Brauer tree should be
3
St φ
35,74φ
160,55φ
350,38φ
448,25φ
350,14φ
160,7E
8[− θ]
E
8[ − θ
2]
φ
35,2D
4,φ′8,3
D
4,φ12,4D
4,φ′′8,9
D
4,φ′′D
4,φ′ 2,162,4