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Properties

Label 18.2.731...000.1
Degree $18$
Signature $[2, 8]$
Discriminant $7.312\times 10^{27}$
Root discriminant \(35.32\)
Ramified primes $2,3,5$
Class number $6$ (GRH)
Class group [6] (GRH)
Galois group $C_6:S_3$ (as 18T12)

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Normalized defining polynomial

Copy content comment:Define the number field
 
Copy content sage:x = polygen(QQ); K.<a> = NumberField(x^18 + 26*x^12 + 412*x^6 - 5832)
 
Copy content gp:K = bnfinit(y^18 + 26*y^12 + 412*y^6 - 5832, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^18 + 26*x^12 + 412*x^6 - 5832);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^18 + 26*x^12 + 412*x^6 - 5832)
 

\( x^{18} + 26x^{12} + 412x^{6} - 5832 \) Copy content Toggle raw display

Copy content comment:Defining polynomial
 
Copy content sage:K.defining_polynomial()
 
Copy content gp:K.pol
 
Copy content magma:DefiningPolynomial(K);
 
Copy content oscar:defining_polynomial(K)
 

Invariants

Degree:  $18$
Copy content comment:Degree over Q
 
Copy content sage:K.degree()
 
Copy content gp:poldegree(K.pol)
 
Copy content magma:Degree(K);
 
Copy content oscar:degree(K)
 
Signature:  $[2, 8]$
Copy content comment:Signature
 
Copy content sage:K.signature()
 
Copy content gp:K.sign
 
Copy content magma:Signature(K);
 
Copy content oscar:signature(K)
 
Discriminant:   \(7312316880125952000000000000\) \(\medspace = 2^{33}\cdot 3^{20}\cdot 5^{12}\) Copy content Toggle raw display
Copy content comment:Discriminant
 
Copy content sage:K.disc()
 
Copy content gp:K.disc
 
Copy content magma:OK := Integers(K); Discriminant(OK);
 
Copy content oscar:OK = ring_of_integers(K); discriminant(OK)
 
Root discriminant:  \(35.32\)
Copy content sage:(K.disc().abs())^(1./K.degree())
 
Copy content gp:abs(K.disc)^(1/poldegree(K.pol))
 
Copy content magma:Abs(Discriminant(OK))^(1/Degree(K));
 
Copy content oscar:(1.0 * dK)^(1/degree(K))
 
Galois root discriminant:  $2^{11/6}3^{7/6}5^{2/3}\approx 37.54134188892015$
Ramified primes:   \(2\), \(3\), \(5\) Copy content Toggle raw display
Copy content comment:Ramified primes
 
Copy content sage:K.disc().support()
 
Copy content gp:factor(abs(K.disc))[,1]~
 
Copy content magma:PrimeDivisors(Discriminant(OK));
 
Copy content oscar:prime_divisors(discriminant((OK)))
 
Discriminant root field:  \(\Q(\sqrt{2}) \)
$\Aut(K/\Q)$:   $C_2$
Copy content comment:Autmorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphisms(K)
 
This field is not Galois over $\Q$.
This is not a CM field.
This field has no CM subfields.

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $\frac{1}{2}a^{6}$, $\frac{1}{6}a^{7}-\frac{1}{3}a$, $\frac{1}{36}a^{8}-\frac{7}{18}a^{2}$, $\frac{1}{36}a^{9}-\frac{7}{18}a^{3}$, $\frac{1}{36}a^{10}-\frac{7}{18}a^{4}$, $\frac{1}{36}a^{11}-\frac{7}{18}a^{5}$, $\frac{1}{1224}a^{12}+\frac{37}{306}a^{6}+\frac{3}{34}$, $\frac{1}{3672}a^{13}-\frac{1}{108}a^{11}+\frac{1}{108}a^{9}+\frac{37}{918}a^{7}+\frac{7}{54}a^{5}-\frac{7}{54}a^{3}+\frac{1}{34}a$, $\frac{1}{3672}a^{14}-\frac{1}{3672}a^{12}+\frac{1}{108}a^{10}+\frac{23}{1836}a^{8}-\frac{37}{918}a^{6}-\frac{7}{54}a^{4}+\frac{64}{153}a^{2}-\frac{1}{34}$, $\frac{1}{3672}a^{15}-\frac{11}{1836}a^{9}-\frac{148}{459}a^{3}$, $\frac{1}{22032}a^{16}+\frac{5}{1377}a^{10}-\frac{653}{5508}a^{4}$, $\frac{1}{66096}a^{17}+\frac{5}{4131}a^{11}-\frac{6161}{16524}a^{5}$ Copy content Toggle raw display

Copy content comment:Integral basis
 
Copy content sage:K.integral_basis()
 
Copy content gp:K.zk
 
Copy content magma:IntegralBasis(K);
 
Copy content oscar:basis(OK)
 

Monogenic:  Not computed
Index:  $1$
Inessential primes:  None

Class group and class number

Ideal class group:  $C_{6}$, which has order $6$ (assuming GRH)
Copy content comment:Class group
 
Copy content sage:K.class_group().invariants()
 
Copy content gp:K.clgp
 
Copy content magma:ClassGroup(K);
 
Copy content oscar:class_group(K)
 
Narrow class group:  $C_{6}$, which has order $6$ (assuming GRH)
Copy content comment:Narrow class group
 
Copy content sage:K.narrow_class_group().invariants()
 
Copy content gp:bnfnarrow(K)
 
Copy content magma:NarrowClassGroup(K);
 

Unit group

Copy content comment:Unit group
 
Copy content sage:UK = K.unit_group()
 
Copy content magma:UK, fUK := UnitGroup(K);
 
Copy content oscar:UK, fUK = unit_group(OK)
 
Rank:  $9$
Copy content comment:Unit rank
 
Copy content sage:UK.rank()
 
Copy content gp:K.fu
 
Copy content magma:UnitRank(K);
 
Copy content oscar:rank(UK)
 
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
Copy content comment:Generator for roots of unity
 
Copy content sage:UK.torsion_generator()
 
Copy content gp:K.tu[2]
 
Copy content magma:K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
Copy content oscar:torsion_units_generator(OK)
 
Fundamental units:   $\frac{1}{22032}a^{16}+\frac{5}{1377}a^{10}-\frac{653}{5508}a^{4}$, $\frac{1}{11016}a^{16}-\frac{1}{3672}a^{14}+\frac{1}{3672}a^{12}-\frac{11}{5508}a^{10}-\frac{23}{1836}a^{8}+\frac{37}{918}a^{6}-\frac{148}{1377}a^{4}-\frac{64}{153}a^{2}+\frac{35}{34}$, $\frac{1}{11016}a^{16}+\frac{1}{1836}a^{14}-\frac{1}{1836}a^{12}-\frac{11}{5508}a^{10}-\frac{5}{1836}a^{8}-\frac{37}{459}a^{6}-\frac{148}{1377}a^{4}+\frac{23}{102}a^{2}-\frac{1}{17}$, $\frac{1}{3672}a^{15}+\frac{10}{459}a^{9}+\frac{265}{918}a^{3}+1$, $\frac{5}{66096}a^{17}+\frac{25}{4131}a^{11}+\frac{2243}{16524}a^{5}+1$, $\frac{5}{66096}a^{17}-\frac{1}{1224}a^{14}+\frac{25}{4131}a^{11}-\frac{23}{612}a^{8}+\frac{2243}{16524}a^{5}-\frac{13}{51}a^{2}$, $\frac{1}{2754}a^{16}-\frac{1}{1836}a^{14}-\frac{1}{3672}a^{12}+\frac{29}{2754}a^{10}+\frac{5}{1836}a^{8}-\frac{37}{918}a^{6}+\frac{428}{1377}a^{4}-\frac{23}{102}a^{2}-\frac{35}{34}$, $\frac{1}{22032}a^{16}+\frac{1}{3672}a^{15}-\frac{1}{918}a^{14}+\frac{1}{612}a^{13}-\frac{1}{1836}a^{12}-\frac{31}{5508}a^{10}+\frac{10}{459}a^{9}-\frac{23}{459}a^{8}+\frac{23}{306}a^{7}-\frac{37}{459}a^{6}+\frac{61}{5508}a^{4}+\frac{265}{918}a^{3}-\frac{103}{153}a^{2}+\frac{26}{51}a-\frac{1}{17}$, $\frac{23}{66096}a^{17}-\frac{1}{1836}a^{16}-\frac{1}{1224}a^{15}+\frac{5}{3672}a^{14}-\frac{1}{408}a^{13}+\frac{13}{3672}a^{12}+\frac{1}{16524}a^{11}-\frac{23}{918}a^{10}+\frac{11}{612}a^{9}+\frac{13}{1836}a^{8}-\frac{1}{34}a^{7}+\frac{11}{459}a^{6}-\frac{3085}{16524}a^{5}+\frac{25}{153}a^{4}-\frac{5}{153}a^{3}-\frac{20}{153}a^{2}+\frac{7}{102}a-\frac{55}{34}$ Copy content Toggle raw display (assuming GRH)
Copy content comment:Fundamental units
 
Copy content sage:UK.fundamental_units()
 
Copy content gp:K.fu
 
Copy content magma:[K|fUK(g): g in Generators(UK)];
 
Copy content oscar:[K(fUK(a)) for a in gens(UK)]
 
Regulator:  \( 2160321.3612944754 \) (assuming GRH)
Copy content comment:Regulator
 
Copy content sage:K.regulator()
 
Copy content gp:K.reg
 
Copy content magma:Regulator(K);
 
Copy content oscar:regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{2}\cdot(2\pi)^{8}\cdot 2160321.3612944754 \cdot 6}{2\cdot\sqrt{7312316880125952000000000000}}\cr\approx \mathstrut & 0.736395373310683 \end{aligned}\] (assuming GRH)

Copy content comment:Analytic class number formula
 
Copy content sage:# self-contained SageMath code snippet to compute the analytic class number formula x = polygen(QQ); K.<a> = NumberField(x^18 + 26*x^12 + 412*x^6 - 5832) DK = K.disc(); r1,r2 = K.signature(); RK = K.regulator(); RR = RK.parent() hK = K.class_number(); wK = K.unit_group().torsion_generator().order(); 2^r1 * (2*RR(pi))^r2 * RK * hK / (wK * RR(sqrt(abs(DK))))
 
Copy content gp:\\ self-contained Pari/GP code snippet to compute the analytic class number formula K = bnfinit(x^18 + 26*x^12 + 412*x^6 - 5832, 1); [polcoeff (lfunrootres (lfuncreate (K))[1][1][2], -1), 2^K.r1 * (2*Pi)^K.r2 * K.reg * K.no / (K.tu[1] * sqrt (abs (K.disc)))]
 
Copy content magma:/* self-contained Magma code snippet to compute the analytic class number formula */ Qx<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^18 + 26*x^12 + 412*x^6 - 5832); OK := Integers(K); DK := Discriminant(OK); UK, fUK := UnitGroup(OK); clK, fclK := ClassGroup(OK); r1,r2 := Signature(K); RK := Regulator(K); RR := Parent(RK); hK := #clK; wK := #TorsionSubgroup(UK); 2^r1 * (2*Pi(RR))^r2 * RK * hK / (wK * Sqrt(RR!Abs(DK)));
 
Copy content oscar:# self-contained Oscar code snippet to compute the analytic class number formula Qx, x = PolynomialRing(QQ); K, a = NumberField(x^18 + 26*x^12 + 412*x^6 - 5832); OK = ring_of_integers(K); DK = discriminant(OK); UK, fUK = unit_group(OK); clK, fclK = class_group(OK); r1,r2 = signature(K); RK = regulator(K); RR = parent(RK); hK = order(clK); wK = torsion_units_order(K); 2^r1 * (2*pi)^r2 * RK * hK / (wK * sqrt(RR(abs(DK))))
 

Galois group

$C_6:S_3$ (as 18T12):

Copy content comment:Galois group
 
Copy content sage:K.galois_group(type='pari')
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:G = GaloisGroup(K);
 
Copy content oscar:G, Gtx = galois_group(K); G, transitive_group_identification(G)
 
A solvable group of order 36
The 12 conjugacy class representatives for $C_6:S_3$
Character table for $C_6:S_3$

Intermediate fields

\(\Q(\sqrt{2}) \), 3.1.2700.1, 3.1.675.1, 3.1.300.1, 3.1.108.1, 6.2.933120000.7, 6.2.11520000.1, 6.2.233280000.13, 6.2.1492992.4, 9.1.59049000000.1

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

Copy content comment:Intermediate fields
 
Copy content sage:K.subfields()[1:-1]
 
Copy content gp:L = nfsubfields(K); L[2..length(b)]
 
Copy content magma:L := Subfields(K); L[2..#L];
 
Copy content oscar:subfields(K)[2:end-1]
 

Sibling fields

Galois closure: data not computed
Degree 18 sibling: 18.0.21936950640377856000000000000.2
Minimal sibling: This field is its own minimal sibling

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R R R ${\href{/padicField/7.3.0.1}{3} }^{6}$ ${\href{/padicField/11.2.0.1}{2} }^{9}$ ${\href{/padicField/13.6.0.1}{6} }^{3}$ ${\href{/padicField/17.2.0.1}{2} }^{8}{,}\,{\href{/padicField/17.1.0.1}{1} }^{2}$ ${\href{/padicField/19.6.0.1}{6} }^{3}$ ${\href{/padicField/23.2.0.1}{2} }^{8}{,}\,{\href{/padicField/23.1.0.1}{1} }^{2}$ ${\href{/padicField/29.2.0.1}{2} }^{9}$ ${\href{/padicField/31.3.0.1}{3} }^{6}$ ${\href{/padicField/37.6.0.1}{6} }^{3}$ ${\href{/padicField/41.2.0.1}{2} }^{8}{,}\,{\href{/padicField/41.1.0.1}{1} }^{2}$ ${\href{/padicField/43.6.0.1}{6} }^{3}$ ${\href{/padicField/47.2.0.1}{2} }^{8}{,}\,{\href{/padicField/47.1.0.1}{1} }^{2}$ ${\href{/padicField/53.2.0.1}{2} }^{9}$ ${\href{/padicField/59.2.0.1}{2} }^{9}$

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

Copy content comment:Frobenius cycle types
 
Copy content sage:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Sage: p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
Copy content gp:\\ to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Pari: p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
Copy content magma:// to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Magma: p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
Copy content oscar:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Oscar: p = 7; pfac = factor(ideal(ring_of_integers(K), p)); [(e, valuation(norm(pr),p)) for (pr,e) in pfac]
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(2\) Copy content Toggle raw display 2.1.6.11a1.5$x^{6} + 4 x^{3} + 2$$6$$1$$11$$D_{6}$$$[3]_{3}^{2}$$
2.2.6.22a1.9$x^{12} + 6 x^{11} + 21 x^{10} + 50 x^{9} + 90 x^{8} + 126 x^{7} + 145 x^{6} + 138 x^{5} + 114 x^{4} + 78 x^{3} + 45 x^{2} + 18 x + 7$$6$$2$$22$$D_6$$$[3]_{3}^{2}$$
\(3\) Copy content Toggle raw display 3.2.3.6a2.1$x^{6} + 6 x^{5} + 18 x^{4} + 32 x^{3} + 39 x^{2} + 30 x + 17$$3$$2$$6$$D_{6}$$$[\frac{3}{2}]_{2}^{2}$$
3.2.6.14a1.3$x^{12} + 12 x^{11} + 72 x^{10} + 280 x^{9} + 780 x^{8} + 1632 x^{7} + 2624 x^{6} + 3264 x^{5} + 3123 x^{4} + 2252 x^{3} + 1176 x^{2} + 408 x + 79$$6$$2$$14$$D_6$$$[\frac{3}{2}]_{2}^{2}$$
\(5\) Copy content Toggle raw display 5.2.3.4a1.2$x^{6} + 12 x^{5} + 54 x^{4} + 112 x^{3} + 108 x^{2} + 48 x + 13$$3$$2$$4$$S_3$$$[\ ]_{3}^{2}$$
5.2.3.4a1.2$x^{6} + 12 x^{5} + 54 x^{4} + 112 x^{3} + 108 x^{2} + 48 x + 13$$3$$2$$4$$S_3$$$[\ ]_{3}^{2}$$
5.2.3.4a1.2$x^{6} + 12 x^{5} + 54 x^{4} + 112 x^{3} + 108 x^{2} + 48 x + 13$$3$$2$$4$$S_3$$$[\ ]_{3}^{2}$$

Spectrum of ring of integers

(0)(0)(2)(3)(5)(7)(11)(13)(17)(19)(23)(29)(31)(37)(41)(43)(47)(53)(59)