CICY Coxeter DB | 6921

CICY6921

  • rank 2
  • I₂(2)
  • finite
Favorable Kähler-favProduct
h1,1h^{1,1}
5
h2,1h^{2,1}
37
χ\chi
−64
ambient factors
5
polynomials
4
iso-flops
2
Coxeter rank
2
Coxeter group
I₂(2)
Configuration matrix
5×4 configuration
X6921=[P11100P11010P12000P21101P20012]−645,37X_{6921} = \left[\begin{array}{c|cccc} \mathbb{P}^{1} & 1 & 1 & 0 & 0 \\ \mathbb{P}^{1} & 1 & 0 & 1 & 0 \\ \mathbb{P}^{1} & 2 & 0 & 0 & 0 \\ \mathbb{P}^{2} & 1 & 1 & 0 & 1 \\ \mathbb{P}^{2} & 0 & 0 & 1 & 2 \end{array}\right]^{5,37}_{-64}
Second Chern class
c2(X)⋅Di=(2424243636)Tc_2(X)\cdot D_i = \begin{pmatrix} 24 & 24 & 24 & 36 & 36 \end{pmatrix}^{T}
Coxeter diagram Gallery →
Coxeter matrix
(1221)\begin{pmatrix} 1 & 2 \\ 2 & 1 \end{pmatrix}
Iso-flop reflections Kähler representation
M^1\hat{M}_1: row 3, Type 2
M^1=(101000110000−1000011000001)\hat{M}_1 = \begin{pmatrix} 1 & 0 & 1 & 0 & 0 \\ 0 & 1 & 1 & 0 & 0 \\ 0 & 0 & -1 & 0 & 0 \\ 0 & 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 0 & 1 \end{pmatrix}
M^2\hat{M}_2: row 5, Type 2
M^2=(100000100200100000110000−1)\hat{M}_2 = \begin{pmatrix} 1 & 0 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 & 2 \\ 0 & 0 & 1 & 0 & 0 \\ 0 & 0 & 0 & 1 & 1 \\ 0 & 0 & 0 & 0 & -1 \end{pmatrix}

Database record

Mathematica 
<|Num -> 6921, H11 -> 5, H21 -> 37, C2 -> {24, 24, 24, 36, 36}, Conf -> {{1, 1, 0, 0}, {1, 0, 1, 0}, {2, 0, 0, 0}, {1, 1, 0, 1}, {0, 0, 1, 2}}, Favour -> True, KahlerPos -> True, IsProduct -> False, IsoFlopRows -> {{3, "Type 2"}, {5, "Type 2"}}, KahlerRefGens -> {{{1, 0, 1, 0, 0}, {0, 1, 1, 0, 0}, {0, 0, -1, 0, 0}, {0, 0, 1, 1, 0}, {0, 0, 0, 0, 1}}, {{1, 0, 0, 0, 0}, {0, 1, 0, 0, 2}, {0, 0, 1, 0, 0}, {0, 0, 0, 1, 1}, {0, 0, 0, 0, -1}}}, CoxeterMat -> {{1, 2}, {2, 1}}|>
Plain text 
Num           : 6921
H11           : 5
H21           : 37
C2            : {24, 24, 24, 36, 36}
Conf          : {{1, 1, 0, 0}, {1, 0, 1, 0}, {2, 0, 0, 0}, {1, 1, 0, 1}, {0, 0, 1, 2}}
Favour        : True
KahlerPos     : True
IsProduct     : False
IsoFlopRows   : {{3, "Type 2"}, {5, "Type 2"}}
KahlerRefGens : {{{1, 0, 1, 0, 0}, {0, 1, 1, 0, 0}, {0, 0, -1, 0, 0}, {0, 0, 1, 1, 0}, {0, 0, 0, 0, 1}}, {{1, 0, 0, 0, 0}, {0, 1, 0, 0, 2}, {0, 0, 1, 0, 0}, {0, 0, 0, 1, 1}, {0, 0, 0, 0, -1}}}
CoxeterMat    : {{1, 2}, {2, 1}}