Normalized defining polynomial
sage: x = polygen(QQ); K.<a> = NumberField(x^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2)
gp: K = bnfinit(y^14 - 7*y^13 + 11*y^12 + 25*y^11 - 79*y^10 - y^9 + 191*y^8 - 197*y^7 + 4*y^6 + 98*y^5 - 20*y^4 - 62*y^3 + 52*y^2 - 16*y + 2, 1)
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2);
oscar: Qx, x = PolynomialRing(QQ); K, a = NumberField(x^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2)
\( x^{14} - 7 x^{13} + 11 x^{12} + 25 x^{11} - 79 x^{10} - x^{9} + 191 x^{8} - 197 x^{7} + 4 x^{6} + \cdots + 2 \)
sage: K.defining_polynomial()
gp: K.pol
magma: DefiningPolynomial(K);
oscar: defining_polynomial(K)
Invariants
| Degree: | $14$ | sage: K.degree()
gp: poldegree(K.pol)
magma: Degree(K);
oscar: degree(K)
| |
| Signature: | $[0, 7]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
| |
| Discriminant: |
\(-4304209926662811648\)
\(\medspace = -\,2^{12}\cdot 3^{12}\cdot 7^{11}\)
| sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
| |
| Root discriminant: | \(21.43\) | 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: | $2^{6/7}3^{6/7}7^{5/6}\approx 23.509053955343234$ | ||
| Ramified primes: |
\(2\), \(3\), \(7\)
| sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
| |
| Discriminant root field: | \(\Q(\sqrt{-7}) \) | ||
| $\card{ \Aut(K/\Q) }$: | $2$ | 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 \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $\frac{1}{3}a^{8}-\frac{1}{3}a^{7}-\frac{1}{3}a^{6}-\frac{1}{3}a^{5}+\frac{1}{3}a^{4}+\frac{1}{3}a^{3}-\frac{1}{3}a^{2}+\frac{1}{3}a+\frac{1}{3}$, $\frac{1}{3}a^{9}+\frac{1}{3}a^{7}+\frac{1}{3}a^{6}-\frac{1}{3}a^{4}-\frac{1}{3}a+\frac{1}{3}$, $\frac{1}{3}a^{10}-\frac{1}{3}a^{7}+\frac{1}{3}a^{6}-\frac{1}{3}a^{4}-\frac{1}{3}a^{3}-\frac{1}{3}$, $\frac{1}{3}a^{11}-\frac{1}{3}a^{6}+\frac{1}{3}a^{5}+\frac{1}{3}a^{3}-\frac{1}{3}a^{2}+\frac{1}{3}$, $\frac{1}{339}a^{12}-\frac{2}{113}a^{11}-\frac{8}{339}a^{10}-\frac{6}{113}a^{9}+\frac{7}{339}a^{8}-\frac{33}{113}a^{7}+\frac{1}{339}a^{6}+\frac{74}{339}a^{5}-\frac{161}{339}a^{4}-\frac{121}{339}a^{3}-\frac{82}{339}a^{2}-\frac{40}{339}a-\frac{55}{113}$, $\frac{1}{8475}a^{13}+\frac{2}{2825}a^{12}+\frac{463}{2825}a^{11}-\frac{1018}{8475}a^{10}-\frac{371}{2825}a^{9}-\frac{229}{1695}a^{8}-\frac{923}{2825}a^{7}-\frac{348}{2825}a^{6}-\frac{3793}{8475}a^{5}-\frac{1036}{8475}a^{4}+\frac{129}{2825}a^{3}+\frac{3044}{8475}a^{2}+\frac{824}{8475}a+\frac{357}{2825}$
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: | $6$ | 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: |
$\frac{4979}{2825}a^{13}-\frac{104128}{8475}a^{12}+\frac{160318}{8475}a^{11}+\frac{128128}{2825}a^{10}-\frac{1176331}{8475}a^{9}-\frac{136}{15}a^{8}+\frac{2912347}{8475}a^{7}-\frac{2826878}{8475}a^{6}-\frac{187741}{8475}a^{5}+\frac{1565768}{8475}a^{4}-\frac{209306}{8475}a^{3}-\frac{333499}{2825}a^{2}+\frac{732263}{8475}a-\frac{160423}{8475}$, $\frac{2116}{2825}a^{13}-\frac{41687}{8475}a^{12}+\frac{52622}{8475}a^{11}+\frac{176236}{8475}a^{10}-\frac{420074}{8475}a^{9}-\frac{10844}{565}a^{8}+\frac{1094663}{8475}a^{7}-\frac{816962}{8475}a^{6}-\frac{191689}{8475}a^{5}+\frac{484472}{8475}a^{4}+\frac{7092}{2825}a^{3}-\frac{345488}{8475}a^{2}+\frac{71709}{2825}a-\frac{45067}{8475}$, $\frac{4979}{2825}a^{13}-\frac{92428}{8475}a^{12}+\frac{90118}{8475}a^{11}+\frac{440509}{8475}a^{10}-\frac{271152}{2825}a^{9}-\frac{43356}{565}a^{8}+\frac{752299}{2825}a^{7}-\frac{1131478}{8475}a^{6}-\frac{683591}{8475}a^{5}+\frac{786643}{8475}a^{4}+\frac{298819}{8475}a^{3}-\frac{618022}{8475}a^{2}+\frac{289688}{8475}a-\frac{17091}{2825}$, $\frac{5624}{8475}a^{13}-\frac{37831}{8475}a^{12}+\frac{51511}{8475}a^{11}+\frac{155543}{8475}a^{10}-\frac{405962}{8475}a^{9}-\frac{7687}{565}a^{8}+\frac{354798}{2825}a^{7}-\frac{841081}{8475}a^{6}-\frac{242882}{8475}a^{5}+\frac{564086}{8475}a^{4}+\frac{3188}{8475}a^{3}-\frac{368494}{8475}a^{2}+\frac{74267}{2825}a-\frac{37771}{8475}$, $\frac{232}{8475}a^{13}+\frac{3692}{8475}a^{12}-\frac{10184}{2825}a^{11}+\frac{12133}{2825}a^{10}+\frac{152384}{8475}a^{9}-\frac{20026}{565}a^{8}-\frac{89461}{2825}a^{7}+\frac{283514}{2825}a^{6}-\frac{67092}{2825}a^{5}-\frac{1418}{25}a^{4}+\frac{156134}{8475}a^{3}+\frac{70836}{2825}a^{2}-\frac{149432}{8475}a+\frac{9999}{2825}$, $\frac{1403}{8475}a^{13}-\frac{15307}{8475}a^{12}+\frac{16214}{2825}a^{11}+\frac{2457}{2825}a^{10}-\frac{281339}{8475}a^{9}+\frac{55123}{1695}a^{8}+\frac{191381}{2825}a^{7}-\frac{1090132}{8475}a^{6}+\frac{239521}{8475}a^{5}+\frac{170064}{2825}a^{4}-\frac{241864}{8475}a^{3}-\frac{281318}{8475}a^{2}+\frac{282947}{8475}a-\frac{54787}{8475}$
| 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: | \( 15666.333906202328 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{7}\cdot 15666.333906202328 \cdot 1}{2\cdot\sqrt{4304209926662811648}}\cr\approx \mathstrut & 1.45965338631577 \end{aligned}\]
# self-contained SageMath code snippet to compute the analytic class number formula
x = polygen(QQ); K.<a> = NumberField(x^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2)
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^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2, 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^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2);
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^14 - 7*x^13 + 11*x^12 + 25*x^11 - 79*x^10 - x^9 + 191*x^8 - 197*x^7 + 4*x^6 + 98*x^5 - 20*x^4 - 62*x^3 + 52*x^2 - 16*x + 2);
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
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 42 |
| The 7 conjugacy class representatives for $F_7$ |
| Character table for $F_7$ |
Intermediate fields
| \(\Q(\sqrt{-7}) \), 7.1.784147392.1 |
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
| Galois closure: | data not computed |
| Degree 7 sibling: | 7.1.784147392.1 |
| Degree 21 sibling: | deg 21 |
| Minimal sibling: | 7.1.784147392.1 |
Frobenius cycle types
| $p$ | $2$ | $3$ | $5$ | $7$ | $11$ | $13$ | $17$ | $19$ | $23$ | $29$ | $31$ | $37$ | $41$ | $43$ | $47$ | $53$ | $59$ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cycle type | R | R | ${\href{/padicField/5.6.0.1}{6} }^{2}{,}\,{\href{/padicField/5.2.0.1}{2} }$ | R | ${\href{/padicField/11.3.0.1}{3} }^{4}{,}\,{\href{/padicField/11.1.0.1}{1} }^{2}$ | ${\href{/padicField/13.2.0.1}{2} }^{7}$ | ${\href{/padicField/17.6.0.1}{6} }^{2}{,}\,{\href{/padicField/17.2.0.1}{2} }$ | ${\href{/padicField/19.6.0.1}{6} }^{2}{,}\,{\href{/padicField/19.2.0.1}{2} }$ | ${\href{/padicField/23.3.0.1}{3} }^{4}{,}\,{\href{/padicField/23.1.0.1}{1} }^{2}$ | ${\href{/padicField/29.7.0.1}{7} }^{2}$ | ${\href{/padicField/31.6.0.1}{6} }^{2}{,}\,{\href{/padicField/31.2.0.1}{2} }$ | ${\href{/padicField/37.3.0.1}{3} }^{4}{,}\,{\href{/padicField/37.1.0.1}{1} }^{2}$ | ${\href{/padicField/41.2.0.1}{2} }^{7}$ | ${\href{/padicField/43.7.0.1}{7} }^{2}$ | ${\href{/padicField/47.6.0.1}{6} }^{2}{,}\,{\href{/padicField/47.2.0.1}{2} }$ | ${\href{/padicField/53.3.0.1}{3} }^{4}{,}\,{\href{/padicField/53.1.0.1}{1} }^{2}$ | ${\href{/padicField/59.6.0.1}{6} }^{2}{,}\,{\href{/padicField/59.2.0.1}{2} }$ |
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 |
|---|---|---|---|---|---|---|---|
|
\(2\)
| 2.7.6.1 | $x^{7} + 2$ | $7$ | $1$ | $6$ | $C_7:C_3$ | $[\ ]_{7}^{3}$ |
| 2.7.6.1 | $x^{7} + 2$ | $7$ | $1$ | $6$ | $C_7:C_3$ | $[\ ]_{7}^{3}$ | |
|
\(3\)
| 3.14.12.1 | $x^{14} + 14 x^{13} + 98 x^{12} + 448 x^{11} + 1484 x^{10} + 3752 x^{9} + 7448 x^{8} + 11782 x^{7} + 14938 x^{6} + 15008 x^{5} + 11452 x^{4} + 6328 x^{3} + 2632 x^{2} + 896 x + 185$ | $7$ | $2$ | $12$ | $F_7$ | $[\ ]_{7}^{6}$ |
|
\(7\)
| 7.2.1.2 | $x^{2} + 7$ | $2$ | $1$ | $1$ | $C_2$ | $[\ ]_{2}$ |
| 7.6.5.5 | $x^{6} + 7$ | $6$ | $1$ | $5$ | $C_6$ | $[\ ]_{6}$ | |
| 7.6.5.5 | $x^{6} + 7$ | $6$ | $1$ | $5$ | $C_6$ | $[\ ]_{6}$ |