Normalized defining polynomial
sage: x = polygen(QQ); K.<a> = NumberField(x^16 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1)
gp: K = bnfinit(y^16 - 7*y^15 + 19*y^14 - 27*y^13 + 19*y^12 + 6*y^11 - 38*y^10 + 66*y^9 - 77*y^8 + 66*y^7 - 38*y^6 + 6*y^5 + 19*y^4 - 27*y^3 + 19*y^2 - 7*y + 1, 1)
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^16 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1);
oscar: Qx, x = polynomial_ring(QQ); K, a = number_field(x^16 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1)
\( x^{16} - 7 x^{15} + 19 x^{14} - 27 x^{13} + 19 x^{12} + 6 x^{11} - 38 x^{10} + 66 x^{9} - 77 x^{8} + \cdots + 1 \)
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: | $[6, 5]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
| |
| Discriminant: |
\(-847267028262109375\)
\(\medspace = -\,5^{8}\cdot 151\cdot 119851^{2}\)
| sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
| |
| Root discriminant: | \(13.20\) | 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: | $5^{1/2}151^{1/2}119851^{1/2}\approx 9512.492049930976$ | ||
| Ramified primes: |
\(5\), \(151\), \(119851\)
| sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
| |
| Discriminant root field: | \(\Q(\sqrt{-151}) \) | ||
| $\card{ \Aut(K/\Q) }$: | $2$ | 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 \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $\frac{1}{59}a^{14}+\frac{18}{59}a^{12}-\frac{19}{59}a^{11}-\frac{14}{59}a^{10}-\frac{14}{59}a^{9}-\frac{4}{59}a^{8}-\frac{7}{59}a^{7}-\frac{4}{59}a^{6}-\frac{14}{59}a^{5}-\frac{14}{59}a^{4}-\frac{19}{59}a^{3}+\frac{18}{59}a^{2}+\frac{1}{59}$, $\frac{1}{59}a^{15}+\frac{18}{59}a^{13}-\frac{19}{59}a^{12}-\frac{14}{59}a^{11}-\frac{14}{59}a^{10}-\frac{4}{59}a^{9}-\frac{7}{59}a^{8}-\frac{4}{59}a^{7}-\frac{14}{59}a^{6}-\frac{14}{59}a^{5}-\frac{19}{59}a^{4}+\frac{18}{59}a^{3}+\frac{1}{59}a$
sage: K.integral_basis()
gp: K.zk
magma: IntegralBasis(K);
oscar: basis(OK)
| Monogenic: | Not computed | |
| Index: | $1$ | |
| Inessential primes: | None |
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: | $10$ | 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: |
$\frac{56}{59}a^{15}-\frac{366}{59}a^{14}+\frac{831}{59}a^{13}-\frac{808}{59}a^{12}+\frac{211}{59}a^{11}+\frac{682}{59}a^{10}-\frac{1649}{59}a^{9}+\frac{2252}{59}a^{8}-\frac{2264}{59}a^{7}+\frac{1506}{59}a^{6}-\frac{675}{59}a^{5}-\frac{365}{59}a^{4}+\frac{764}{59}a^{3}-\frac{747}{59}a^{2}+\frac{233}{59}a-\frac{71}{59}$, $\frac{3}{59}a^{15}-\frac{47}{59}a^{14}+\frac{290}{59}a^{13}-\frac{785}{59}a^{12}+\frac{910}{59}a^{11}-\frac{328}{59}a^{10}-\frac{593}{59}a^{9}+\frac{1642}{59}a^{8}-\frac{2279}{59}a^{7}+\frac{2388}{59}a^{6}-\frac{1567}{59}a^{5}+\frac{719}{59}a^{4}+\frac{357}{59}a^{3}-\frac{846}{59}a^{2}+\frac{829}{59}a-\frac{283}{59}$, $\frac{50}{59}a^{15}-\frac{213}{59}a^{14}+\frac{133}{59}a^{13}+\frac{349}{59}a^{12}-\frac{665}{59}a^{11}+\frac{630}{59}a^{10}-\frac{286}{59}a^{9}-\frac{206}{59}a^{8}+\frac{937}{59}a^{7}-\frac{1087}{59}a^{6}+\frac{1043}{59}a^{5}-\frac{564}{59}a^{4}+\frac{50}{59}a^{3}+\frac{532}{59}a^{2}-\frac{481}{59}a+\frac{141}{59}$, $\frac{79}{59}a^{15}-\frac{516}{59}a^{14}+\frac{1304}{59}a^{13}-\frac{1762}{59}a^{12}+\frac{1087}{59}a^{11}+\frac{690}{59}a^{10}-\frac{2709}{59}a^{9}+\frac{4461}{59}a^{8}-\frac{4905}{59}a^{7}+\frac{3967}{59}a^{6}-\frac{1965}{59}a^{5}+a^{4}+\frac{1491}{59}a^{3}-\frac{1795}{59}a^{2}+\frac{1141}{59}a-\frac{280}{59}$, $a$, $a-1$, $\frac{30}{59}a^{15}-\frac{133}{59}a^{14}+\frac{127}{59}a^{13}+\frac{45}{59}a^{12}-\frac{135}{59}a^{11}+\frac{203}{59}a^{10}-\frac{205}{59}a^{9}+\frac{204}{59}a^{8}-\frac{74}{59}a^{7}+\frac{53}{59}a^{6}+\frac{26}{59}a^{5}-\frac{65}{59}a^{4}-\frac{1}{59}a^{3}+\frac{25}{59}a^{2}+\frac{30}{59}a-\frac{74}{59}$, $\frac{102}{59}a^{15}-\frac{829}{59}a^{14}+\frac{2544}{59}a^{13}-\frac{3703}{59}a^{12}+\frac{2346}{59}a^{11}+\frac{1092}{59}a^{10}-\frac{5263}{59}a^{9}+\frac{8679}{59}a^{8}-\frac{9886}{59}a^{7}+136a^{6}-\frac{4159}{59}a^{5}+\frac{110}{59}a^{4}+\frac{2955}{59}a^{3}-\frac{3653}{59}a^{2}+\frac{2226}{59}a-\frac{475}{59}$, $\frac{66}{59}a^{15}-\frac{399}{59}a^{14}+\frac{952}{59}a^{13}-\frac{1356}{59}a^{12}+\frac{993}{59}a^{11}+\frac{355}{59}a^{10}-\frac{1994}{59}a^{9}+\frac{3494}{59}a^{8}-\frac{3902}{59}a^{7}+\frac{3504}{59}a^{6}-\frac{1828}{59}a^{5}+\frac{261}{59}a^{4}+\frac{1099}{59}a^{3}-\frac{1400}{59}a^{2}+\frac{1069}{59}a-\frac{340}{59}$, $\frac{126}{59}a^{15}-\frac{682}{59}a^{14}+\frac{1147}{59}a^{13}-\frac{628}{59}a^{12}-\frac{488}{59}a^{11}+\frac{1648}{59}a^{10}-\frac{2402}{59}a^{9}+\frac{2613}{59}a^{8}-\frac{1689}{59}a^{7}+\frac{492}{59}a^{6}+\frac{645}{59}a^{5}-\frac{1224}{59}a^{4}+\frac{1184}{59}a^{3}-\frac{417}{59}a^{2}-\frac{228}{59}a+\frac{203}{59}$
| 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: | \( 448.860326258 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{6}\cdot(2\pi)^{5}\cdot 448.860326258 \cdot 1}{2\cdot\sqrt{847267028262109375}}\cr\approx \mathstrut & 0.152809511688 \end{aligned}\]
# self-contained SageMath code snippet to compute the analytic class number formula
x = polygen(QQ); K.<a> = NumberField(x^16 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1)
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 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1, 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 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1);
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 - 7*x^15 + 19*x^14 - 27*x^13 + 19*x^12 + 6*x^11 - 38*x^10 + 66*x^9 - 77*x^8 + 66*x^7 - 38*x^6 + 6*x^5 + 19*x^4 - 27*x^3 + 19*x^2 - 7*x + 1);
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
$C_2^6.S_4^2:D_4$ (as 16T1905):
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 294912 |
| The 230 conjugacy class representatives for $C_2^6.S_4^2:D_4$ |
| Character table for $C_2^6.S_4^2:D_4$ |
Intermediate fields
| \(\Q(\sqrt{5}) \), 8.6.74906875.1 |
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 16 siblings: | data not computed |
| Degree 32 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 | ${\href{/padicField/2.8.0.1}{8} }^{2}$ | $16$ | R | $16$ | ${\href{/padicField/11.4.0.1}{4} }^{4}$ | ${\href{/padicField/13.6.0.1}{6} }^{2}{,}\,{\href{/padicField/13.4.0.1}{4} }$ | ${\href{/padicField/17.12.0.1}{12} }{,}\,{\href{/padicField/17.4.0.1}{4} }$ | ${\href{/padicField/19.6.0.1}{6} }^{2}{,}\,{\href{/padicField/19.2.0.1}{2} }^{2}$ | ${\href{/padicField/23.6.0.1}{6} }^{2}{,}\,{\href{/padicField/23.4.0.1}{4} }$ | ${\href{/padicField/29.8.0.1}{8} }^{2}$ | ${\href{/padicField/31.8.0.1}{8} }{,}\,{\href{/padicField/31.3.0.1}{3} }^{2}{,}\,{\href{/padicField/31.2.0.1}{2} }$ | ${\href{/padicField/37.8.0.1}{8} }^{2}$ | ${\href{/padicField/41.4.0.1}{4} }{,}\,{\href{/padicField/41.2.0.1}{2} }^{4}{,}\,{\href{/padicField/41.1.0.1}{1} }^{4}$ | ${\href{/padicField/43.4.0.1}{4} }^{2}{,}\,{\href{/padicField/43.2.0.1}{2} }^{4}$ | ${\href{/padicField/47.4.0.1}{4} }^{2}{,}\,{\href{/padicField/47.2.0.1}{2} }^{4}$ | $16$ | ${\href{/padicField/59.6.0.1}{6} }{,}\,{\href{/padicField/59.4.0.1}{4} }{,}\,{\href{/padicField/59.1.0.1}{1} }^{6}$ |
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 |
|---|---|---|---|---|---|---|---|
|
\(5\)
| 5.16.8.1 | $x^{16} + 160 x^{15} + 11240 x^{14} + 453600 x^{13} + 11536702 x^{12} + 190484240 x^{11} + 2020220586 x^{10} + 13041178608 x^{9} + 45239382035 x^{8} + 65384309200 x^{7} + 52374358166 x^{6} + 35488260768 x^{5} + 46408266743 x^{4} + 66345171264 x^{3} + 136057926318 x^{2} + 159173865296 x + 74196697609$ | $2$ | $8$ | $8$ | $C_8\times C_2$ | $[\ ]_{2}^{8}$ |
|
\(151\)
| $\Q_{151}$ | $x + 145$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ |
| $\Q_{151}$ | $x + 145$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| 151.2.1.1 | $x^{2} + 453$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ | |
| 151.2.0.1 | $x^{2} + 149 x + 6$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | |
| 151.2.0.1 | $x^{2} + 149 x + 6$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | |
| 151.2.0.1 | $x^{2} + 149 x + 6$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | |
| 151.2.0.1 | $x^{2} + 149 x + 6$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | |
| 151.4.0.1 | $x^{4} + 13 x^{2} + 89 x + 6$ | $1$ | $4$ | $0$ | $C_4$ | $[\ ]^{4}$ | |
|
\(119851\)
| $\Q_{119851}$ | $x$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ |
| $\Q_{119851}$ | $x$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| $\Q_{119851}$ | $x$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| $\Q_{119851}$ | $x$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| $\Q_{119851}$ | $x$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| $\Q_{119851}$ | $x$ | $1$ | $1$ | $0$ | Trivial | $[\ ]$ | |
| Deg $2$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | ||
| Deg $2$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | ||
| Deg $2$ | $1$ | $2$ | $0$ | $C_2$ | $[\ ]^{2}$ | ||
| Deg $4$ | $2$ | $2$ | $2$ |