Properties

 Label 18.0.566...000.1 Degree $18$ Signature $[0, 9]$ Discriminant $-5.669\times 10^{19}$ Root discriminant $12.51$ Ramified primes $2, 5, 7$ Class number $1$ Class group trivial Galois group $S_3 \times C_6$ (as 18T6)

Related objects

Show commands: SageMath / Pari/GP / Magma

Normalizeddefining polynomial

sage: x = polygen(QQ); K.<a> = NumberField(x^18 - 6*x^17 + 21*x^16 - 54*x^15 + 116*x^14 - 226*x^13 + 412*x^12 - 686*x^11 + 997*x^10 - 1220*x^9 + 1225*x^8 - 994*x^7 + 652*x^6 - 356*x^5 + 169*x^4 - 70*x^3 + 25*x^2 - 6*x + 1)

gp: K = bnfinit(x^18 - 6*x^17 + 21*x^16 - 54*x^15 + 116*x^14 - 226*x^13 + 412*x^12 - 686*x^11 + 997*x^10 - 1220*x^9 + 1225*x^8 - 994*x^7 + 652*x^6 - 356*x^5 + 169*x^4 - 70*x^3 + 25*x^2 - 6*x + 1, 1)

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1, -6, 25, -70, 169, -356, 652, -994, 1225, -1220, 997, -686, 412, -226, 116, -54, 21, -6, 1]);

$$x^{18} - 6 x^{17} + 21 x^{16} - 54 x^{15} + 116 x^{14} - 226 x^{13} + 412 x^{12} - 686 x^{11} + 997 x^{10} - 1220 x^{9} + 1225 x^{8} - 994 x^{7} + 652 x^{6} - 356 x^{5} + 169 x^{4} - 70 x^{3} + 25 x^{2} - 6 x + 1$$

sage: K.defining_polynomial()

gp: K.pol

magma: DefiningPolynomial(K);

Invariants

 Degree: $18$ sage: K.degree()  gp: poldegree(K.pol)  magma: Degree(K); Signature: $[0, 9]$ sage: K.signature()  gp: K.sign  magma: Signature(K); Discriminant: $$-56693912375296000000$$$$\medspace = -\,2^{18}\cdot 5^{6}\cdot 7^{12}$$ sage: K.disc()  gp: K.disc  magma: Discriminant(Integers(K)); Root discriminant: $12.51$ sage: (K.disc().abs())^(1./K.degree())  gp: abs(K.disc)^(1/poldegree(K.pol))  magma: Abs(Discriminant(Integers(K)))^(1/Degree(K)); Ramified primes: $2, 5, 7$ sage: K.disc().support()  gp: factor(abs(K.disc))[,1]~  magma: PrimeDivisors(Discriminant(Integers(K))); $|\Aut(K/\Q)|$: $6$ This field is not Galois over $\Q$. This is not a CM field.

Integral basis (with respect to field generator $$a$$)

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $a^{16}$, $\frac{1}{256977029} a^{17} - \frac{40852282}{256977029} a^{16} - \frac{90896428}{256977029} a^{15} - \frac{71267825}{256977029} a^{14} - \frac{1410251}{256977029} a^{13} + \frac{25972511}{256977029} a^{12} + \frac{121908911}{256977029} a^{11} - \frac{26733424}{256977029} a^{10} - \frac{63355470}{256977029} a^{9} + \frac{73314996}{256977029} a^{8} + \frac{38926272}{256977029} a^{7} - \frac{14676092}{256977029} a^{6} - \frac{60488711}{256977029} a^{5} + \frac{126710720}{256977029} a^{4} + \frac{103649471}{256977029} a^{3} + \frac{98776940}{256977029} a^{2} - \frac{69678780}{256977029} a - \frac{111122987}{256977029}$

sage: K.integral_basis()

gp: K.zk

magma: IntegralBasis(K);

Class group and class number

Trivial group, which has order $1$

sage: K.class_group().invariants()

gp: K.clgp

magma: ClassGroup(K);

Unit group

sage: UK = K.unit_group()

magma: UK, f := UnitGroup(K);

 Rank: $8$ sage: UK.rank()  gp: K.fu  magma: UnitRank(K); Torsion generator: $$-\frac{1958110}{2274133} a^{17} + \frac{12793711}{2274133} a^{16} - \frac{46575486}{2274133} a^{15} + \frac{122807849}{2274133} a^{14} - \frac{266884792}{2274133} a^{13} + \frac{521638226}{2274133} a^{12} - \frac{954283917}{2274133} a^{11} + \frac{1603216417}{2274133} a^{10} - \frac{2360935244}{2274133} a^{9} + \frac{2923198932}{2274133} a^{8} - \frac{2951830859}{2274133} a^{7} + \frac{2374393719}{2274133} a^{6} - \frac{1506363920}{2274133} a^{5} + \frac{772674530}{2274133} a^{4} - \frac{344556129}{2274133} a^{3} + \frac{137069085}{2274133} a^{2} - \frac{42484885}{2274133} a + \frac{8138860}{2274133}$$ (order $4$) sage: UK.torsion_generator()  gp: K.tu[2]  magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K); Fundamental units: Units are too long to display, but can be downloaded with other data for this field from 'Stored data to gp' link to the right sage: UK.fundamental_units()  gp: K.fu  magma: [K!f(g): g in Generators(UK)]; Regulator: $$476.20211267413316$$ sage: K.regulator()  gp: K.reg  magma: Regulator(K);

Class number formula

$\displaystyle\lim_{s\to 1} (s-1)\zeta_K(s) \approx\frac{2^{0}\cdot(2\pi)^{9}\cdot 476.20211267413316 \cdot 1}{4\sqrt{56693912375296000000}}\approx 0.241313671675920$

Galois group

$C_6\times S_3$ (as 18T6):

sage: K.galois_group(type='pari')

gp: polgalois(K.pol)

magma: GaloisGroup(K);

 A solvable group of order 36 The 18 conjugacy class representatives for $S_3 \times C_6$ Character table for $S_3 \times C_6$

Intermediate fields

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Sibling fields

 Galois closure: data not computed Degree 12 sibling: 12.0.153664000000.1 Degree 18 sibling: 18.6.110730297608000000000.1

Frobenius cycle types

 $p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$ Cycle type R ${\href{/padicField/3.6.0.1}{6} }^{3}$ R R ${\href{/padicField/11.6.0.1}{6} }^{3}$ ${\href{/padicField/13.2.0.1}{2} }^{6}{,}\,{\href{/padicField/13.1.0.1}{1} }^{6}$ ${\href{/padicField/17.6.0.1}{6} }^{2}{,}\,{\href{/padicField/17.3.0.1}{3} }^{2}$ ${\href{/padicField/19.6.0.1}{6} }^{3}$ ${\href{/padicField/23.6.0.1}{6} }^{3}$ ${\href{/padicField/29.3.0.1}{3} }^{6}$ ${\href{/padicField/31.6.0.1}{6} }^{3}$ ${\href{/padicField/37.6.0.1}{6} }^{2}{,}\,{\href{/padicField/37.3.0.1}{3} }^{2}$ ${\href{/padicField/41.3.0.1}{3} }^{6}$ ${\href{/padicField/43.6.0.1}{6} }^{3}$ ${\href{/padicField/47.6.0.1}{6} }^{3}$ ${\href{/padicField/53.6.0.1}{6} }^{2}{,}\,{\href{/padicField/53.3.0.1}{3} }^{2}$ ${\href{/padicField/59.6.0.1}{6} }^{3}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

sage: p = 7; # to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:

sage: [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]

gp: p = 7; \\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:

gp: idealfactors = idealprimedec(K, p); \\ get the data

gp: vector(length(idealfactors), j, [idealfactors[j][3], idealfactors[j][4]])

magma: p := 7; // to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:

magma: idealfactors := Factorization(p*Integers(K)); // get the data

magma: [<primefactor[2], Valuation(Norm(primefactor[1]), p)> : primefactor in idealfactors];

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
$2$2.6.6.3$x^{6} + 2 x^{4} + x^{2} - 7$$2$$3$$6$$C_6$$[2]^{3} 2.12.12.26x^{12} - 162 x^{10} + 26423 x^{8} + 125508 x^{6} - 64481 x^{4} - 122498 x^{2} - 86071$$2$$6$$12$$C_6\times C_2$$[2]^{6}$
$5$5.3.0.1$x^{3} - x + 2$$1$$3$$0$$C_3$$[\ ]^{3} 5.3.0.1x^{3} - x + 2$$1$$3$$0$$C_3$$[\ ]^{3}$
5.6.3.1$x^{6} - 10 x^{4} + 25 x^{2} - 500$$2$$3$$3$$C_6$$[\ ]_{2}^{3} 5.6.3.1x^{6} - 10 x^{4} + 25 x^{2} - 500$$2$$3$$3$$C_6$$[\ ]_{2}^{3}$
$7$Data not computed