CICY7281

rank 1
ℤ₂
finite

Favorable Kähler-favProduct

$h^{1,1}$: 4
$h^{2,1}$: 40
$\chi$: −72
ambient factors: 4
polynomials: 5
iso-flops: 1
Coxeter rank: 1
Coxeter group: ℤ₂

Configuration matrix: 4×5 configuration
$X_{7281} = \left[\begin{array}{c|ccccc} \mathbb{P}^{1} & 1 & 1 & 0 & 0 & 0 \\ \mathbb{P}^{1} & 1 & 0 & 1 & 0 & 0 \\ \mathbb{P}^{2} & 0 & 1 & 1 & 1 & 0 \\ \mathbb{P}^{4} & 1 & 0 & 1 & 1 & 2 \end{array}\right]^{4,40}_{-72}$
Second Chern class: $c_2(X)\cdot D_i = \begin{pmatrix} 24 & 24 & 36 & 52 \end{pmatrix}^{T}$
Coxeter diagram Gallery →
Coxeter matrix: $\begin{pmatrix} 1 \end{pmatrix}$
Iso-flop reflections Kähler representation: $\hat{M}_1$ : row 4, Type 2
$\hat{M}_1 = \begin{pmatrix} 1 & 0 & 0 & 2 \\ 0 & 1 & 0 & 4 \\ 0 & 0 & 1 & 4 \\ 0 & 0 & 0 & -1 \end{pmatrix}$

Database record

Mathematica

<|Num -> 7281, H11 -> 4, H21 -> 40, C2 -> {24, 24, 36, 52}, Conf -> {{1, 1, 0, 0, 0}, {1, 0, 1, 0, 0}, {0, 1, 1, 1, 0}, {1, 0, 1, 1, 2}}, Favour -> True, KahlerPos -> True, IsProduct -> False, IsoFlopRows -> {{4, "Type 2"}}, KahlerRefGens -> {{{1, 0, 0, 2}, {0, 1, 0, 4}, {0, 0, 1, 4}, {0, 0, 0, -1}}}, CoxeterMat -> {{1}}|>

Plain text

Num           : 7281
H11           : 4
H21           : 40
C2            : {24, 24, 36, 52}
Conf          : {{1, 1, 0, 0, 0}, {1, 0, 1, 0, 0}, {0, 1, 1, 1, 0}, {1, 0, 1, 1, 2}}
Favour        : True
KahlerPos     : True
IsProduct     : False
IsoFlopRows   : {{4, "Type 2"}}
KahlerRefGens : {{{1, 0, 0, 2}, {0, 1, 0, 4}, {0, 0, 1, 4}, {0, 0, 0, -1}}}
CoxeterMat    : {{1}}