Properties

Label 16.0.119...144.8
Degree $16$
Signature $[0, 8]$
Discriminant $1.198\times 10^{20}$
Root discriminant \(17.99\)
Ramified primes $2,17$
Class number $1$
Class group trivial
Galois group $C_2^3:C_4$ (as 16T33)

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Show commands: Magma / Oscar / PariGP / SageMath

Normalized defining polynomial

sage: x = polygen(QQ); K.<a> = NumberField(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32)
 
gp: K = bnfinit(y^16 - 2*y^15 + y^14 + 8*y^13 - 40*y^12 + 56*y^11 - 24*y^10 - 112*y^9 + 383*y^8 - 598*y^7 + 723*y^6 - 544*y^5 + 384*y^4 - 104*y^3 + 92*y^2 + 32, 1)
 
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32);
 
oscar: Qx, x = PolynomialRing(QQ); K, a = NumberField(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32)
 

\( x^{16} - 2 x^{15} + x^{14} + 8 x^{13} - 40 x^{12} + 56 x^{11} - 24 x^{10} - 112 x^{9} + 383 x^{8} + \cdots + 32 \) Copy content Toggle raw display

sage: K.defining_polynomial()
 
gp: K.pol
 
magma: DefiningPolynomial(K);
 
oscar: defining_polynomial(K)
 

Invariants

Degree:  $16$
sage: K.degree()
 
gp: poldegree(K.pol)
 
magma: Degree(K);
 
oscar: degree(K)
 
Signature:  $[0, 8]$
sage: K.signature()
 
gp: K.sign
 
magma: Signature(K);
 
oscar: signature(K)
 
Discriminant:   \(119842600295694598144\) \(\medspace = 2^{34}\cdot 17^{8}\) Copy content Toggle raw display
sage: K.disc()
 
gp: K.disc
 
magma: OK := Integers(K); Discriminant(OK);
 
oscar: OK = ring_of_integers(K); discriminant(OK)
 
Root discriminant:  \(17.99\)
sage: (K.disc().abs())^(1./K.degree())
 
gp: abs(K.disc)^(1/poldegree(K.pol))
 
magma: Abs(Discriminant(OK))^(1/Degree(K));
 
oscar: (1.0 * dK)^(1/degree(K))
 
Galois root discriminant:  $2^{11/4}17^{1/2}\approx 27.736837922354518$
Ramified primes:   \(2\), \(17\) Copy content Toggle raw display
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
magma: PrimeDivisors(Discriminant(OK));
 
oscar: prime_divisors(discriminant((OK)))
 
Discriminant root field:  \(\Q\)
$\card{ \Aut(K/\Q) }$:  $8$
sage: K.automorphisms()
 
magma: Automorphisms(K);
 
oscar: automorphisms(K)
 
This field is not Galois over $\Q$.
This is not a CM field.

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $\frac{1}{2}a^{6}-\frac{1}{2}a^{2}$, $\frac{1}{2}a^{7}-\frac{1}{2}a^{3}$, $\frac{1}{2}a^{8}-\frac{1}{2}a^{4}$, $\frac{1}{4}a^{9}-\frac{1}{4}a^{7}-\frac{1}{4}a^{5}-\frac{1}{4}a^{3}-\frac{1}{2}a$, $\frac{1}{4}a^{10}-\frac{1}{4}a^{8}-\frac{1}{4}a^{6}-\frac{1}{4}a^{4}-\frac{1}{2}a^{2}$, $\frac{1}{16}a^{11}+\frac{1}{16}a^{10}+\frac{1}{16}a^{9}+\frac{1}{16}a^{8}+\frac{3}{16}a^{7}-\frac{1}{16}a^{6}-\frac{3}{16}a^{5}-\frac{3}{16}a^{4}+\frac{1}{8}a^{3}-\frac{1}{8}a^{2}$, $\frac{1}{48}a^{12}-\frac{1}{12}a^{10}+\frac{1}{12}a^{9}-\frac{1}{24}a^{8}-\frac{1}{6}a^{7}-\frac{1}{8}a^{6}-\frac{1}{12}a^{5}+\frac{17}{48}a^{4}-\frac{1}{2}a^{3}-\frac{7}{24}a^{2}+\frac{1}{6}a+\frac{1}{3}$, $\frac{1}{96}a^{13}-\frac{1}{96}a^{12}+\frac{1}{48}a^{11}+\frac{1}{48}a^{10}-\frac{1}{8}a^{9}-\frac{1}{8}a^{8}+\frac{1}{12}a^{7}+\frac{1}{12}a^{6}-\frac{11}{32}a^{5}+\frac{25}{96}a^{4}+\frac{5}{48}a^{3}+\frac{17}{48}a^{2}-\frac{1}{6}a-\frac{1}{6}$, $\frac{1}{96}a^{14}-\frac{1}{96}a^{12}-\frac{1}{48}a^{11}-\frac{1}{12}a^{10}+\frac{5}{48}a^{9}-\frac{1}{16}a^{8}+\frac{7}{48}a^{7}-\frac{7}{96}a^{6}-\frac{5}{16}a^{5}+\frac{19}{96}a^{4}-\frac{1}{6}a^{3}-\frac{19}{48}a^{2}-\frac{1}{2}a-\frac{1}{2}$, $\frac{1}{299263584}a^{15}+\frac{276121}{149631792}a^{14}+\frac{458825}{149631792}a^{13}-\frac{1882277}{299263584}a^{12}+\frac{106565}{9351987}a^{11}+\frac{4000889}{49877264}a^{10}+\frac{244015}{3117329}a^{9}+\frac{725697}{12469316}a^{8}+\frac{26764151}{299263584}a^{7}+\frac{92377}{149631792}a^{6}+\frac{8684187}{49877264}a^{5}-\frac{97895479}{299263584}a^{4}-\frac{24940433}{74815896}a^{3}-\frac{28382999}{149631792}a^{2}-\frac{1412115}{3117329}a-\frac{2963191}{18703974}$ Copy content Toggle raw display

sage: K.integral_basis()
 
gp: K.zk
 
magma: IntegralBasis(K);
 
oscar: basis(OK)
 

Monogenic:  No
Index:  Not computed
Inessential primes:  $2$

Class group and class number

Trivial group, which has order $1$

sage: K.class_group().invariants()
 
gp: K.clgp
 
magma: ClassGroup(K);
 
oscar: class_group(K)
 

Unit group

sage: UK = K.unit_group()
 
magma: UK, fUK := UnitGroup(K);
 
oscar: UK, fUK = unit_group(OK)
 
Rank:  $7$
sage: UK.rank()
 
gp: K.fu
 
magma: UnitRank(K);
 
oscar: rank(UK)
 
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
sage: UK.torsion_generator()
 
gp: K.tu[2]
 
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
oscar: torsion_units_generator(OK)
 
Fundamental units:   $\frac{725027}{9653664}a^{15}-\frac{630067}{3217888}a^{14}+\frac{160301}{1608944}a^{13}+\frac{1691515}{2413416}a^{12}-\frac{1366593}{402236}a^{11}+\frac{13044587}{2413416}a^{10}-\frac{3904403}{2413416}a^{9}-\frac{26503957}{2413416}a^{8}+\frac{109088043}{3217888}a^{7}-\frac{510929051}{9653664}a^{6}+\frac{268747721}{4826832}a^{5}-\frac{89909335}{2413416}a^{4}+\frac{21813797}{1206708}a^{3}-\frac{3770209}{804472}a^{2}+\frac{191985}{201118}a-\frac{413108}{301677}$, $\frac{4684729}{299263584}a^{15}-\frac{1515301}{299263584}a^{14}-\frac{1373825}{37407948}a^{13}+\frac{708577}{6234658}a^{12}-\frac{17738545}{49877264}a^{11}-\frac{22325975}{149631792}a^{10}+\frac{36199879}{49877264}a^{9}-\frac{52044105}{49877264}a^{8}+\frac{548774629}{299263584}a^{7}-\frac{94377725}{299263584}a^{6}+\frac{42598265}{49877264}a^{5}-\frac{43643087}{49877264}a^{4}+\frac{43039858}{9351987}a^{3}-\frac{6457972}{3117329}a^{2}+\frac{19483450}{9351987}a+\frac{4569179}{9351987}$, $\frac{3056919}{99754528}a^{15}+\frac{7308265}{149631792}a^{14}-\frac{18478867}{99754528}a^{13}+\frac{12799799}{49877264}a^{12}-\frac{6804509}{37407948}a^{11}-\frac{130667875}{49877264}a^{10}+\frac{656816105}{149631792}a^{9}-\frac{371382383}{149631792}a^{8}-\frac{409342185}{99754528}a^{7}+\frac{1604710945}{74815896}a^{6}-\frac{8729891789}{299263584}a^{5}+\frac{193258427}{6234658}a^{4}-\frac{1588569091}{149631792}a^{3}+\frac{315459677}{37407948}a^{2}+\frac{55857763}{18703974}a+\frac{38944327}{9351987}$, $\frac{20023439}{149631792}a^{15}-\frac{1022316}{3117329}a^{14}+\frac{27121663}{149631792}a^{13}+\frac{170666893}{149631792}a^{12}-\frac{872624953}{149631792}a^{11}+\frac{461370007}{49877264}a^{10}-\frac{575006251}{149631792}a^{9}-\frac{827949651}{49877264}a^{8}+\frac{179013799}{3117329}a^{7}-\frac{4672439901}{49877264}a^{6}+\frac{2695743067}{24938632}a^{5}-\frac{6302323283}{74815896}a^{4}+\frac{979924087}{18703974}a^{3}-\frac{360562793}{18703974}a^{2}+\frac{140966891}{18703974}a-\frac{35373067}{9351987}$, $\frac{4610777}{149631792}a^{15}-\frac{98557}{18703974}a^{14}-\frac{11908399}{149631792}a^{13}+\frac{9296473}{37407948}a^{12}-\frac{106103317}{149631792}a^{11}-\frac{71118275}{149631792}a^{10}+\frac{280361525}{149631792}a^{9}-\frac{448886587}{149631792}a^{8}+\frac{101045411}{24938632}a^{7}+\frac{258205651}{149631792}a^{6}-\frac{41928560}{9351987}a^{5}+\frac{1287505901}{149631792}a^{4}-\frac{14668543}{9351987}a^{3}+\frac{60104597}{24938632}a^{2}+\frac{72004205}{18703974}a+\frac{2426602}{3117329}$, $\frac{6333787}{149631792}a^{15}-\frac{6452009}{149631792}a^{14}-\frac{7285357}{149631792}a^{13}+\frac{13900621}{37407948}a^{12}-\frac{201728167}{149631792}a^{11}+\frac{102064477}{149631792}a^{10}+\frac{213522755}{149631792}a^{9}-\frac{272840325}{49877264}a^{8}+\frac{862403719}{74815896}a^{7}-\frac{351435997}{37407948}a^{6}+\frac{66090131}{12469316}a^{5}+\frac{924376541}{149631792}a^{4}-\frac{25008930}{3117329}a^{3}+\frac{983230333}{74815896}a^{2}-\frac{90010253}{18703974}a+\frac{42041650}{9351987}$, $\frac{4254677}{18703974}a^{15}-\frac{7661781}{12469316}a^{14}+\frac{940500}{3117329}a^{13}+\frac{20206664}{9351987}a^{12}-\frac{32570090}{3117329}a^{11}+\frac{157525822}{9351987}a^{10}-\frac{42858196}{9351987}a^{9}-\frac{317634266}{9351987}a^{8}+\frac{650537017}{6234658}a^{7}-\frac{6094785217}{37407948}a^{6}+\frac{1576140560}{9351987}a^{5}-\frac{1081135223}{9351987}a^{4}+\frac{498215450}{9351987}a^{3}-\frac{49689355}{3117329}a^{2}+\frac{6940064}{3117329}a-\frac{33535553}{9351987}$ Copy content Toggle raw display
sage: UK.fundamental_units()
 
gp: K.fu
 
magma: [K|fUK(g): g in Generators(UK)];
 
oscar: [K(fUK(a)) for a in gens(UK)]
 
Regulator:  \( 76945.8851596 \)
sage: K.regulator()
 
gp: K.reg
 
magma: Regulator(K);
 
oscar: regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{8}\cdot 76945.8851596 \cdot 1}{2\cdot\sqrt{119842600295694598144}}\cr\approx \mathstrut & 8.53667483673 \end{aligned}\]

# self-contained SageMath code snippet to compute the analytic class number formula
 
x = polygen(QQ); K.<a> = NumberField(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32)
 
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))))
 
# self-contained Pari/GP code snippet to compute the analytic class number formula
 
K = bnfinit(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32, 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)))]
 
/* self-contained Magma code snippet to compute the analytic class number formula */
 
Qx<x> := PolynomialRing(QQ); K<a> := NumberField(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32);
 
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)));
 
# self-contained Oscar code snippet to compute the analytic class number formula
 
Qx, x = PolynomialRing(QQ); K, a = NumberField(x^16 - 2*x^15 + x^14 + 8*x^13 - 40*x^12 + 56*x^11 - 24*x^10 - 112*x^9 + 383*x^8 - 598*x^7 + 723*x^6 - 544*x^5 + 384*x^4 - 104*x^3 + 92*x^2 + 32);
 
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

$C_2^3:C_4$ (as 16T33):

sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
magma: G = GaloisGroup(K);
 
oscar: G, Gtx = galois_group(K); G, transitive_group_identification(G)
 
A solvable group of order 32
The 11 conjugacy class representatives for $C_2^3:C_4$
Character table for $C_2^3:C_4$

Intermediate fields

\(\Q(\sqrt{2}) \), \(\Q(\sqrt{34}) \), \(\Q(\sqrt{17}) \), 4.0.2312.1 x2, \(\Q(\sqrt{2}, \sqrt{17})\), 4.0.1088.2 x2, 8.0.1368408064.3 x2, 8.0.342102016.2, 8.4.10947264512.1 x2

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

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

Sibling fields

Galois closure: deg 32
Degree 8 siblings: 8.4.1212153856.4, 8.4.10947264512.1, 8.0.1368408064.3, 8.0.350312464384.4
Degree 16 siblings: 16.8.122718822702791268499456.3, deg 16, 16.0.424632604507928264704.1
Minimal sibling: 8.0.1368408064.3

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R ${\href{/padicField/3.4.0.1}{4} }^{4}$ ${\href{/padicField/5.4.0.1}{4} }^{4}$ ${\href{/padicField/7.4.0.1}{4} }^{4}$ ${\href{/padicField/11.4.0.1}{4} }^{4}$ ${\href{/padicField/13.4.0.1}{4} }^{2}{,}\,{\href{/padicField/13.2.0.1}{2} }^{4}$ R ${\href{/padicField/19.4.0.1}{4} }^{2}{,}\,{\href{/padicField/19.2.0.1}{2} }^{4}$ ${\href{/padicField/23.4.0.1}{4} }^{4}$ ${\href{/padicField/29.4.0.1}{4} }^{4}$ ${\href{/padicField/31.2.0.1}{2} }^{8}$ ${\href{/padicField/37.4.0.1}{4} }^{4}$ ${\href{/padicField/41.4.0.1}{4} }^{4}$ ${\href{/padicField/43.4.0.1}{4} }^{2}{,}\,{\href{/padicField/43.2.0.1}{2} }^{4}$ ${\href{/padicField/47.2.0.1}{2} }^{8}$ ${\href{/padicField/53.4.0.1}{4} }^{2}{,}\,{\href{/padicField/53.2.0.1}{2} }^{4}$ ${\href{/padicField/59.4.0.1}{4} }^{2}{,}\,{\href{/padicField/59.2.0.1}{2} }^{4}$

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

# to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7$ in Sage:
 
p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
\\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7$ in Pari:
 
p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
// to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7 in Magma:
 
p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
# to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ 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 2.2.3.1$x^{2} + 4 x + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.1$x^{2} + 4 x + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.1$x^{2} + 4 x + 2$$2$$1$$3$$C_2$$[3]$
2.2.3.1$x^{2} + 4 x + 2$$2$$1$$3$$C_2$$[3]$
2.4.11.1$x^{4} + 8 x^{3} + 4 x^{2} + 2$$4$$1$$11$$C_4$$[3, 4]$
2.4.11.1$x^{4} + 8 x^{3} + 4 x^{2} + 2$$4$$1$$11$$C_4$$[3, 4]$
\(17\) Copy content Toggle raw display 17.4.2.1$x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
17.4.2.1$x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
17.4.2.1$x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$
17.4.2.1$x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$$2$$2$$2$$C_2^2$$[\ ]_{2}^{2}$