Properties

Label 34.0.770...296.1
Degree $34$
Signature $[0, 17]$
Discriminant $-7.705\times 10^{56}$
Root discriminant \(47.11\)
Ramified primes $2,17$
Class number $1$ (GRH)
Class group trivial (GRH)
Galois group $C_2\times F_{17}$ (as 34T9)

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Show commands: Magma / Oscar / PariGP / SageMath

Normalized defining polynomial

sage: x = polygen(QQ); K.<a> = NumberField(x^34 - 2*x^17 + 2)
 
gp: K = bnfinit(y^34 - 2*y^17 + 2, 1)
 
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^34 - 2*x^17 + 2);
 
oscar: Qx, x = PolynomialRing(QQ); K, a = NumberField(x^34 - 2*x^17 + 2)
 

\( x^{34} - 2x^{17} + 2 \) Copy content Toggle raw display

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

Invariants

Degree:  $34$
sage: K.degree()
 
gp: poldegree(K.pol)
 
magma: Degree(K);
 
oscar: degree(K)
 
Signature:  $[0, 17]$
sage: K.signature()
 
gp: K.sign
 
magma: Signature(K);
 
oscar: signature(K)
 
Discriminant:   \(-770483087302237618924031213653875461627441440985549111296\) \(\medspace = -\,2^{50}\cdot 17^{34}\) 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:  \(47.11\)
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:  $2^{25/17}17^{287/272}\approx 55.08022815278142$
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:  \(\Q(\sqrt{-1}) \)
$\card{ \Aut(K/\Q) }$:  $2$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $a^{15}$, $a^{16}$, $a^{17}$, $a^{18}$, $a^{19}$, $a^{20}$, $a^{21}$, $a^{22}$, $a^{23}$, $a^{24}$, $a^{25}$, $a^{26}$, $a^{27}$, $a^{28}$, $a^{29}$, $a^{30}$, $a^{31}$, $a^{32}$, $a^{33}$ 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 $1$ (assuming GRH)

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:  $16$
sage: UK.rank()
 
gp: K.fu
 
magma: UnitRank(K);
 
oscar: rank(UK)
 
Torsion generator:   \( -a^{17} + 1 \)  (order $4$) 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:   $a^{18}-a+1$, $a^{18}-a^{17}-a+1$, $a^{17}-a^{2}-1$, $a^{19}-a^{17}-a^{2}+a+1$, $a^{19}-a^{18}+a^{17}-a^{2}+a-1$, $a^{31}+a^{30}-a^{27}-a^{26}+a^{23}+a^{22}-a^{19}-a^{18}-a^{14}-2a^{13}+a^{10}+2a^{9}-a^{6}-2a^{5}+a^{2}+2a+1$, $a^{32}-a^{29}+a^{28}-a^{26}+a^{23}-a^{22}+a^{20}+a^{18}-a^{17}-2a^{15}+a^{14}-a^{11}+2a^{9}-a^{8}+a^{5}-2a^{3}+a^{2}-a+1$, $a^{33}+a^{32}+a^{28}+a^{27}+a^{26}+a^{22}+a^{21}+a^{20}-a^{16}-a^{15}+a^{14}-2a^{11}-a^{10}-a^{9}+a^{8}-2a^{5}-a^{4}-a^{3}+a^{2}-1$, $a^{32}-a^{30}-a^{28}+a^{22}-a^{18}+a^{17}-2a^{15}+a^{14}+2a^{11}-a^{10}+a^{6}-1$, $a^{29}+a^{26}+a^{20}+a^{18}+a^{17}-a^{14}-a^{12}+a^{10}-a^{6}-2a^{3}+a^{2}-1$, $a^{33}+a^{32}-a^{30}-a^{29}+a^{27}+a^{26}-a^{25}-a^{24}-a^{23}+a^{21}+2a^{20}-a^{19}-a^{18}-2a^{16}-a^{15}+2a^{14}+a^{13}-a^{11}-2a^{10}-a^{9}+3a^{8}+2a^{7}-a^{5}-a^{4}-a^{3}+3a^{2}+2a-1$, $a^{33}-a^{29}+a^{28}-a^{27}-a^{25}-a^{24}+a^{23}-a^{22}+a^{21}-a^{20}+a^{19}+a^{18}-a^{15}+2a^{14}-a^{13}+2a^{12}-a^{11}+a^{9}-a^{8}+2a^{7}-2a^{6}+a^{5}-a^{4}-a^{3}+a^{2}-2a+1$, $a^{33}-a^{32}+a^{30}-a^{29}+2a^{28}-a^{27}-2a^{24}+a^{23}-2a^{22}+a^{20}-a^{19}+2a^{18}-a^{17}-a^{16}+3a^{15}-2a^{14}-3a^{11}+2a^{10}-2a^{9}+2a^{8}+a^{7}-a^{6}+3a^{5}-2a^{4}+a^{3}-a+3$, $a^{32}+a^{31}+a^{30}+a^{29}+a^{28}-2a^{26}-3a^{25}-2a^{24}+a^{23}+3a^{22}+3a^{21}+a^{20}-a^{19}-a^{18}-a^{17}-a^{16}-4a^{15}-3a^{14}-a^{13}+a^{12}+2a^{11}+a^{10}+2a^{9}+2a^{8}+a^{7}-2a^{6}-5a^{5}-4a^{4}-a^{3}+4a^{2}+5a+3$, $a^{32}+a^{29}-a^{24}-a^{22}-a^{21}-a^{19}+a^{17}+a^{16}-a^{15}+a^{14}-2a^{12}-a^{10}-a^{9}+2a^{5}+a^{4}+a^{3}+2a^{2}-1$, $a^{30}-a^{29}+a^{25}-a^{24}+a^{21}-a^{20}+a^{19}-a^{18}+a^{16}-2a^{13}+a^{12}+a^{11}+a^{10}-a^{9}-a^{7}+a^{6}+a^{5}-a^{4}+2a^{3}-3a^{2}+a+1$ Copy content Toggle raw display (assuming GRH)
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:  \( 2332460652781060.5 \) (assuming GRH)
sage: K.regulator()
 
gp: K.reg
 
magma: Regulator(K);
 
oscar: regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{17}\cdot 2332460652781060.5 \cdot 1}{4\cdot\sqrt{770483087302237618924031213653875461627441440985549111296}}\cr\approx \mathstrut & 0.778808247347210 \end{aligned}\] (assuming GRH)

# self-contained SageMath code snippet to compute the analytic class number formula
 
x = polygen(QQ); K.<a> = NumberField(x^34 - 2*x^17 + 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^34 - 2*x^17 + 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^34 - 2*x^17 + 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^34 - 2*x^17 + 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

$C_2\times F_{17}$ (as 34T9):

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 544
The 34 conjugacy class representatives for $C_2\times F_{17}$
Character table for $C_2\times F_{17}$

Intermediate fields

\(\Q(\sqrt{-1}) \), 17.1.54214017802982966177103872.1

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 34 sibling: 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 $16^{2}{,}\,{\href{/padicField/3.2.0.1}{2} }$ $16^{2}{,}\,{\href{/padicField/5.1.0.1}{1} }^{2}$ $16^{2}{,}\,{\href{/padicField/7.2.0.1}{2} }$ $16^{2}{,}\,{\href{/padicField/11.2.0.1}{2} }$ ${\href{/padicField/13.4.0.1}{4} }^{8}{,}\,{\href{/padicField/13.1.0.1}{1} }^{2}$ R ${\href{/padicField/19.8.0.1}{8} }^{4}{,}\,{\href{/padicField/19.2.0.1}{2} }$ $16^{2}{,}\,{\href{/padicField/23.2.0.1}{2} }$ $16^{2}{,}\,{\href{/padicField/29.1.0.1}{1} }^{2}$ $16^{2}{,}\,{\href{/padicField/31.2.0.1}{2} }$ $16^{2}{,}\,{\href{/padicField/37.1.0.1}{1} }^{2}$ $16^{2}{,}\,{\href{/padicField/41.1.0.1}{1} }^{2}$ ${\href{/padicField/43.8.0.1}{8} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }$ ${\href{/padicField/47.4.0.1}{4} }^{8}{,}\,{\href{/padicField/47.2.0.1}{2} }$ ${\href{/padicField/53.8.0.1}{8} }^{4}{,}\,{\href{/padicField/53.1.0.1}{1} }^{2}$ ${\href{/padicField/59.8.0.1}{8} }^{4}{,}\,{\href{/padicField/59.2.0.1}{2} }$

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 Deg $34$$34$$1$$50$
\(17\) Copy content Toggle raw display 17.17.17.1$x^{17} + 17 x + 17$$17$$1$$17$$F_{17}$$[17/16]_{16}$
17.17.17.1$x^{17} + 17 x + 17$$17$$1$$17$$F_{17}$$[17/16]_{16}$