Properties

Label 7.7.79397476.1
Degree $7$
Signature $[7, 0]$
Discriminant $79397476$
Root discriminant \(13.44\)
Ramified primes $2,29,47,14563$
Class number $1$
Class group trivial
Galois group $S_7$ (as 7T7)

Related objects

Downloads

Learn more

Show commands: Magma / Oscar / PariGP / SageMath

Normalized defining polynomial

sage: x = polygen(QQ); K.<a> = NumberField(x^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*x + 2)
 
gp: K = bnfinit(y^7 - 3*y^6 - 3*y^5 + 13*y^4 - y^3 - 12*y^2 + 2*y + 2, 1)
 
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*x + 2);
 
oscar: Qx, x = PolynomialRing(QQ); K, a = NumberField(x^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*x + 2)
 

\( x^{7} - 3x^{6} - 3x^{5} + 13x^{4} - x^{3} - 12x^{2} + 2x + 2 \) Copy content Toggle raw display

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

Invariants

Degree:  $7$
sage: K.degree()
 
gp: poldegree(K.pol)
 
magma: Degree(K);
 
oscar: degree(K)
 
Signature:  $[7, 0]$
sage: K.signature()
 
gp: K.sign
 
magma: Signature(K);
 
oscar: signature(K)
 
Discriminant:   \(79397476\) \(\medspace = 2^{2}\cdot 29\cdot 47\cdot 14563\) 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:  \(13.44\)
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:  $2^{2/3}29^{1/2}47^{1/2}14563^{1/2}\approx 7072.289280032421$
Ramified primes:   \(2\), \(29\), \(47\), \(14563\) 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:  \(\Q(\sqrt{19849369}) \)
$\card{ \Aut(K/\Q) }$:  $1$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$ Copy content Toggle raw display

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

Monogenic:  Yes
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 $2$) 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:   $a-1$, $a^{5}-2a^{4}-4a^{3}+7a^{2}+2a-3$, $a^{5}-2a^{4}-4a^{3}+7a^{2}+3a-3$, $a^{5}-2a^{4}-3a^{3}+6a^{2}-a-1$, $a^{6}-a^{5}-6a^{4}+3a^{3}+9a^{2}-a-3$, $a^{6}-2a^{5}-5a^{4}+8a^{3}+6a^{2}-4a-1$ 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:  \( 51.3778536518 \)
sage: K.regulator()
 
gp: K.reg
 
magma: Regulator(K);
 
oscar: regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{7}\cdot(2\pi)^{0}\cdot 51.3778536518 \cdot 1}{2\cdot\sqrt{79397476}}\cr\approx \mathstrut & 0.369022275896 \end{aligned}\]

# self-contained SageMath code snippet to compute the analytic class number formula
 
x = polygen(QQ); K.<a> = NumberField(x^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*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^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*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^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*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^7 - 3*x^6 - 3*x^5 + 13*x^4 - x^3 - 12*x^2 + 2*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

$S_7$ (as 7T7):

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 non-solvable group of order 5040
The 15 conjugacy class representatives for $S_7$
Character table for $S_7$

Intermediate fields

The extension is primitive: there are no intermediate fields between this field and $\Q$.
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 14 sibling: deg 14
Degree 21 sibling: deg 21
Degree 30 sibling: deg 30
Degree 35 sibling: deg 35
Degree 42 siblings: deg 42, deg 42, deg 42, deg 42
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 ${\href{/padicField/3.7.0.1}{7} }$ ${\href{/padicField/5.7.0.1}{7} }$ ${\href{/padicField/7.7.0.1}{7} }$ ${\href{/padicField/11.7.0.1}{7} }$ ${\href{/padicField/13.4.0.1}{4} }{,}\,{\href{/padicField/13.3.0.1}{3} }$ ${\href{/padicField/17.3.0.1}{3} }^{2}{,}\,{\href{/padicField/17.1.0.1}{1} }$ ${\href{/padicField/19.5.0.1}{5} }{,}\,{\href{/padicField/19.2.0.1}{2} }$ ${\href{/padicField/23.4.0.1}{4} }{,}\,{\href{/padicField/23.2.0.1}{2} }{,}\,{\href{/padicField/23.1.0.1}{1} }$ R ${\href{/padicField/31.3.0.1}{3} }^{2}{,}\,{\href{/padicField/31.1.0.1}{1} }$ ${\href{/padicField/37.4.0.1}{4} }{,}\,{\href{/padicField/37.2.0.1}{2} }{,}\,{\href{/padicField/37.1.0.1}{1} }$ ${\href{/padicField/41.7.0.1}{7} }$ ${\href{/padicField/43.7.0.1}{7} }$ R ${\href{/padicField/53.3.0.1}{3} }{,}\,{\href{/padicField/53.2.0.1}{2} }{,}\,{\href{/padicField/53.1.0.1}{1} }^{2}$ ${\href{/padicField/59.5.0.1}{5} }{,}\,{\href{/padicField/59.2.0.1}{2} }$

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

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(2\) Copy content Toggle raw display 2.3.2.1$x^{3} + 2$$3$$1$$2$$S_3$$[\ ]_{3}^{2}$
2.4.0.1$x^{4} + x + 1$$1$$4$$0$$C_4$$[\ ]^{4}$
\(29\) Copy content Toggle raw display 29.2.1.2$x^{2} + 58$$2$$1$$1$$C_2$$[\ ]_{2}$
29.5.0.1$x^{5} + 3 x + 27$$1$$5$$0$$C_5$$[\ ]^{5}$
\(47\) Copy content Toggle raw display 47.2.0.1$x^{2} + 45 x + 5$$1$$2$$0$$C_2$$[\ ]^{2}$
47.2.1.2$x^{2} + 47$$2$$1$$1$$C_2$$[\ ]_{2}$
47.3.0.1$x^{3} + 3 x + 42$$1$$3$$0$$C_3$$[\ ]^{3}$
\(14563\) Copy content Toggle raw display Deg $2$$1$$2$$0$$C_2$$[\ ]^{2}$
Deg $2$$2$$1$$1$$C_2$$[\ ]_{2}$
Deg $3$$1$$3$$0$$C_3$$[\ ]^{3}$

Artin representations

Label Dimension Conductor Artin stem field $G$ Ind $\chi(c)$
* 1.1.1t1.a.a$1$ $1$ \(\Q\) $C_1$ $1$ $1$
1.19849369.2t1.a.a$1$ $ 29 \cdot 47 \cdot 14563 $ \(\Q(\sqrt{19849369}) \) $C_2$ (as 2T1) $1$ $1$
6.123...396.14t46.a.a$6$ $ 2^{2} \cdot 29^{5} \cdot 47^{5} \cdot 14563^{5}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $6$
* 6.79397476.7t7.a.a$6$ $ 2^{2} \cdot 29 \cdot 47 \cdot 14563 $ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $6$
14.397...776.21t38.a.a$14$ $ 2^{8} \cdot 29^{4} \cdot 47^{4} \cdot 14563^{4}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $14$
14.243...056.42t413.a.a$14$ $ 2^{8} \cdot 29^{10} \cdot 47^{10} \cdot 14563^{10}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $14$
14.489...296.30t565.a.a$14$ $ 2^{10} \cdot 29^{9} \cdot 47^{9} \cdot 14563^{9}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $14$
14.315...376.30t565.a.a$14$ $ 2^{10} \cdot 29^{5} \cdot 47^{5} \cdot 14563^{5}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $14$
15.788...344.42t412.a.a$15$ $ 2^{8} \cdot 29^{5} \cdot 47^{5} \cdot 14563^{5}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $15$
15.243...056.42t411.a.a$15$ $ 2^{8} \cdot 29^{10} \cdot 47^{10} \cdot 14563^{10}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $15$
20.388...896.70.a.a$20$ $ 2^{12} \cdot 29^{10} \cdot 47^{10} \cdot 14563^{10}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $20$
21.622...336.84.a.a$21$ $ 2^{16} \cdot 29^{10} \cdot 47^{10} \cdot 14563^{10}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $21$
21.123...984.42t418.a.a$21$ $ 2^{16} \cdot 29^{11} \cdot 47^{11} \cdot 14563^{11}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $21$
35.151...816.126.a.a$35$ $ 2^{24} \cdot 29^{20} \cdot 47^{20} \cdot 14563^{20}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $35$
35.490...584.70.a.a$35$ $ 2^{24} \cdot 29^{15} \cdot 47^{15} \cdot 14563^{15}$ 7.7.79397476.1 $S_7$ (as 7T7) $1$ $35$

Data is given for all irreducible representations of the Galois group for the Galois closure of this field. Those marked with * are summands in the permutation representation coming from this field. Representations which appear with multiplicity greater than one are indicated by exponents on the *.