Normalized defining polynomial
sage: x = polygen(QQ); K.<a> = NumberField(x^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34)
gp: K = bnfinit(y^12 + 17*y^8 - 85*y^6 + 51*y^4 + 34*y^2 - 34, 1)
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34);
oscar: Qx, x = polynomial_ring(QQ); K, a = number_field(x^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34)
\( x^{12} + 17x^{8} - 85x^{6} + 51x^{4} + 34x^{2} - 34 \)
sage: K.defining_polynomial()
gp: K.pol
magma: DefiningPolynomial(K);
oscar: defining_polynomial(K)
Invariants
| Degree: | $12$ | sage: K.degree()
gp: poldegree(K.pol)
magma: Degree(K);
oscar: degree(K)
| |
| Signature: | $[2, 5]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
| |
| Discriminant: |
\(-4492085992834072576\)
\(\medspace = -\,2^{17}\cdot 17^{11}\)
| sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
| |
| Root discriminant: | \(35.84\) | 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: | $2^{51/16}17^{11/12}\approx 122.30511559717738$ | ||
| Ramified primes: |
\(2\), \(17\)
| sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
| |
| Discriminant root field: | \(\Q(\sqrt{-34}) \) | ||
| $\card{ \Aut(K/\Q) }$: | $2$ | 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 \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $\frac{1}{13}a^{8}-\frac{1}{13}a^{6}+\frac{4}{13}a^{4}+\frac{3}{13}a^{2}+\frac{5}{13}$, $\frac{1}{13}a^{9}-\frac{1}{13}a^{7}+\frac{4}{13}a^{5}+\frac{3}{13}a^{3}+\frac{5}{13}a$, $\frac{1}{4069}a^{10}-\frac{14}{4069}a^{8}-\frac{100}{4069}a^{6}+\frac{1628}{4069}a^{4}+\frac{421}{4069}a^{2}+\frac{103}{313}$, $\frac{1}{8138}a^{11}-\frac{1}{8138}a^{10}+\frac{23}{626}a^{9}-\frac{23}{626}a^{8}+\frac{1828}{4069}a^{7}-\frac{1828}{4069}a^{6}-\frac{1189}{8138}a^{5}+\frac{1189}{8138}a^{4}+\frac{680}{4069}a^{3}-\frac{680}{4069}a^{2}+\frac{1452}{4069}a-\frac{1452}{4069}$
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
$C_{2}$, which has order $2$
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: | $6$ | sage: UK.rank()
gp: K.fu
magma: UnitRank(K);
oscar: rank(UK)
| |
| Torsion generator: |
\( -1 \)
(order $2$)
| 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: |
$\frac{584}{4069}a^{10}+\frac{588}{4069}a^{8}+\frac{10147}{4069}a^{6}-\frac{39580}{4069}a^{4}-\frac{16743}{4069}a^{2}+\frac{32341}{4069}$, $\frac{123}{4069}a^{10}+\frac{12}{313}a^{8}+\frac{2098}{4069}a^{6}-\frac{7901}{4069}a^{4}-\frac{3618}{4069}a^{2}+\frac{3189}{4069}$, $\frac{1041}{4069}a^{10}+\frac{1076}{4069}a^{8}+\frac{18596}{4069}a^{6}-\frac{69633}{4069}a^{4}-\frac{23414}{4069}a^{2}+\frac{23585}{4069}$, $\frac{121}{4069}a^{11}+\frac{123}{4069}a^{10}+\frac{184}{4069}a^{9}+\frac{12}{313}a^{8}+\frac{2298}{4069}a^{7}+\frac{2098}{4069}a^{6}-\frac{7088}{4069}a^{5}-\frac{7901}{4069}a^{4}-\frac{4460}{4069}a^{3}-\frac{3618}{4069}a^{2}+\frac{511}{4069}a+\frac{11327}{4069}$, $\frac{60}{4069}a^{11}-\frac{68}{4069}a^{10}+\frac{99}{4069}a^{9}+\frac{1}{313}a^{8}+\frac{1199}{4069}a^{7}-\frac{399}{4069}a^{6}-\frac{4358}{4069}a^{5}+\frac{7610}{4069}a^{4}+\frac{3663}{4069}a^{3}-\frac{7031}{4069}a^{2}-\frac{414}{4069}a+\frac{1909}{4069}$, $\frac{3431}{4069}a^{11}-\frac{4613}{4069}a^{10}+\frac{5176}{4069}a^{9}-\frac{5217}{4069}a^{8}+\frac{63487}{4069}a^{7}-\frac{83320}{4069}a^{6}-\frac{199198}{4069}a^{5}+\frac{300012}{4069}a^{4}-\frac{174072}{4069}a^{3}+\frac{123101}{4069}a^{2}+\frac{18049}{4069}a-\frac{68299}{4069}$
| 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: | \( 126690.654584 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{2}\cdot(2\pi)^{5}\cdot 126690.654584 \cdot 2}{2\cdot\sqrt{4492085992834072576}}\cr\approx \mathstrut & 2.34142301241 \end{aligned}\]
# self-contained SageMath code snippet to compute the analytic class number formula
x = polygen(QQ); K.<a> = NumberField(x^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34)
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^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34, 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^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34);
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^12 + 17*x^8 - 85*x^6 + 51*x^4 + 34*x^2 - 34);
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
$S_4^2:D_4$ (as 12T260):
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 4608 |
| The 65 conjugacy class representatives for $S_4^2:D_4$ |
| Character table for $S_4^2:D_4$ |
Intermediate fields
| \(\Q(\sqrt{17}) \), 6.2.11358856.1 |
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
| Degree 12 siblings: | data not computed |
| Degree 16 siblings: | data not computed |
| Degree 24 siblings: | data not computed |
| Degree 32 siblings: | data not computed |
| Degree 36 siblings: | data not computed |
| 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 | ${\href{/padicField/3.4.0.1}{4} }^{3}$ | ${\href{/padicField/5.8.0.1}{8} }{,}\,{\href{/padicField/5.4.0.1}{4} }$ | ${\href{/padicField/7.6.0.1}{6} }^{2}$ | ${\href{/padicField/11.8.0.1}{8} }{,}\,{\href{/padicField/11.2.0.1}{2} }^{2}$ | ${\href{/padicField/13.2.0.1}{2} }^{3}{,}\,{\href{/padicField/13.1.0.1}{1} }^{6}$ | R | ${\href{/padicField/19.4.0.1}{4} }{,}\,{\href{/padicField/19.3.0.1}{3} }^{2}{,}\,{\href{/padicField/19.2.0.1}{2} }$ | ${\href{/padicField/23.4.0.1}{4} }^{2}{,}\,{\href{/padicField/23.2.0.1}{2} }^{2}$ | ${\href{/padicField/29.8.0.1}{8} }{,}\,{\href{/padicField/29.4.0.1}{4} }$ | ${\href{/padicField/31.6.0.1}{6} }^{2}$ | ${\href{/padicField/37.4.0.1}{4} }^{2}{,}\,{\href{/padicField/37.2.0.1}{2} }^{2}$ | ${\href{/padicField/41.12.0.1}{12} }$ | ${\href{/padicField/43.4.0.1}{4} }{,}\,{\href{/padicField/43.2.0.1}{2} }^{3}{,}\,{\href{/padicField/43.1.0.1}{1} }^{2}$ | ${\href{/padicField/47.6.0.1}{6} }{,}\,{\href{/padicField/47.3.0.1}{3} }^{2}$ | ${\href{/padicField/53.6.0.1}{6} }{,}\,{\href{/padicField/53.4.0.1}{4} }{,}\,{\href{/padicField/53.2.0.1}{2} }$ | ${\href{/padicField/59.6.0.1}{6} }{,}\,{\href{/padicField/59.4.0.1}{4} }{,}\,{\href{/padicField/59.1.0.1}{1} }^{2}$ |
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
| $p$ | Label | Polynomial | $e$ | $f$ | $c$ | Galois group | Slope content |
|---|---|---|---|---|---|---|---|
|
\(2\)
| $\Q_{2}$ | $x + 1$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ |
| $\Q_{2}$ | $x + 1$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| 2.4.11.15 | $x^{4} + 12 x^{2} + 8 x + 2$ | $4$ | $1$ | $11$ | $D_{4}$ | $[2, 3, 4]$ | |
| 2.6.6.1 | $x^{6} + 6 x^{5} + 34 x^{4} + 80 x^{3} + 204 x^{2} + 216 x + 216$ | $2$ | $3$ | $6$ | $A_4$ | $[2, 2]^{3}$ | |
|
\(17\)
| 17.12.11.2 | $x^{12} + 34$ | $12$ | $1$ | $11$ | $S_3 \times C_4$ | $[\ ]_{12}^{2}$ |