Properties

Label 20.0.284...000.1
Degree $20$
Signature $(0, 10)$
Discriminant $2.850\times 10^{27}$
Root discriminant \(23.59\)
Ramified primes $2,5,7$
Class number $1$ (GRH)
Class group trivial (GRH)
Galois group $D_4\times F_5$ (as 20T42)

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Normalized defining polynomial

Copy content comment:Define the number field
 
Copy content sage:x = polygen(QQ); K.<a> = NumberField(x^20 + 7)
 
Copy content gp:K = bnfinit(y^20 + 7, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 + 7);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 + 7)
 

\( x^{20} + 7 \) Copy content Toggle raw display

Copy content comment:Defining polynomial
 
Copy content sage:K.defining_polynomial()
 
Copy content gp:K.pol
 
Copy content magma:DefiningPolynomial(K);
 
Copy content oscar:defining_polynomial(K)
 

Invariants

Degree:  $20$
Copy content comment:Degree over Q
 
Copy content sage:K.degree()
 
Copy content gp:poldegree(K.pol)
 
Copy content magma:Degree(K);
 
Copy content oscar:degree(K)
 
Signature:  $(0, 10)$
Copy content comment:Signature
 
Copy content sage:K.signature()
 
Copy content gp:K.sign
 
Copy content magma:Signature(K);
 
Copy content oscar:signature(K)
 
Discriminant:   \(2849723796343285750000000000\) \(\medspace = 2^{10}\cdot 5^{12}\cdot 7^{19}\) Copy content Toggle raw display
Copy content comment:Discriminant
 
Copy content sage:K.disc()
 
Copy content gp:K.disc
 
Copy content magma:OK := Integers(K); Discriminant(OK);
 
Copy content oscar:OK = ring_of_integers(K); discriminant(OK)
 
Root discriminant:  \(23.59\)
Copy content comment:Root discriminant
 
Copy content sage:(K.disc().abs())^(1./K.degree())
 
Copy content gp:abs(K.disc)^(1/poldegree(K.pol))
 
Copy content magma:Abs(Discriminant(OK))^(1/Degree(K));
 
Copy content oscar:OK = ring_of_integers(K); (1.0 * abs(discriminant(OK)))^(1/degree(K))
 
Galois root discriminant:  $2\cdot 5^{3/4}7^{19/20}\approx 42.47179703557583$
Ramified primes:   \(2\), \(5\), \(7\) Copy content Toggle raw display
Copy content comment:Ramified primes
 
Copy content sage:K.disc().support()
 
Copy content gp:factor(abs(K.disc))[,1]~
 
Copy content magma:PrimeDivisors(Discriminant(OK));
 
Copy content oscar:prime_divisors(discriminant(OK))
 
Discriminant root field:  \(\Q(\sqrt{7}) \)
$\Aut(K/\Q)$:   $C_2$
Copy content comment:Automorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphism_group(K)
 
This field is not Galois over $\Q$.
This is not a CM field.
Maximal CM subfield:  \(\Q(\sqrt{-7}) \)

Integral basis (with respect to field generator \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{2}a^{10}-\frac{1}{2}$, $\frac{1}{2}a^{11}-\frac{1}{2}a$, $\frac{1}{2}a^{12}-\frac{1}{2}a^{2}$, $\frac{1}{2}a^{13}-\frac{1}{2}a^{3}$, $\frac{1}{2}a^{14}-\frac{1}{2}a^{4}$, $\frac{1}{4}a^{15}-\frac{1}{4}a^{10}+\frac{1}{4}a^{5}-\frac{1}{4}$, $\frac{1}{20}a^{16}-\frac{1}{10}a^{12}-\frac{1}{4}a^{11}+\frac{1}{5}a^{8}+\frac{1}{4}a^{6}-\frac{2}{5}a^{4}-\frac{1}{2}a^{2}-\frac{1}{4}a-\frac{1}{5}$, $\frac{1}{20}a^{17}-\frac{1}{10}a^{13}-\frac{1}{4}a^{12}+\frac{1}{5}a^{9}+\frac{1}{4}a^{7}-\frac{2}{5}a^{5}-\frac{1}{2}a^{3}-\frac{1}{4}a^{2}-\frac{1}{5}a$, $\frac{1}{20}a^{18}-\frac{1}{10}a^{14}-\frac{1}{4}a^{13}+\frac{1}{5}a^{10}+\frac{1}{4}a^{8}-\frac{2}{5}a^{6}-\frac{1}{2}a^{4}-\frac{1}{4}a^{3}-\frac{1}{5}a^{2}$, $\frac{1}{20}a^{19}-\frac{1}{10}a^{15}-\frac{1}{4}a^{14}+\frac{1}{5}a^{11}+\frac{1}{4}a^{9}-\frac{2}{5}a^{7}-\frac{1}{2}a^{5}-\frac{1}{4}a^{4}-\frac{1}{5}a^{3}$ Copy content Toggle raw display

Copy content comment:Integral basis
 
Copy content sage:K.integral_basis()
 
Copy content gp:K.zk
 
Copy content magma:IntegralBasis(K);
 
Copy content oscar:basis(OK)
 

Monogenic:  Not computed
Index:  $1$
Inessential primes:  None

Class group and class number

Ideal class group:  Trivial group, which has order $1$ (assuming GRH)
Copy content comment:Class group
 
Copy content sage:K.class_group().invariants()
 
Copy content gp:K.clgp
 
Copy content magma:ClassGroup(K);
 
Copy content oscar:class_group(K)
 
Narrow class group:  Trivial group, which has order $1$ (assuming GRH)
Copy content comment:Narrow class group
 
Copy content sage:K.narrow_class_group().invariants()
 
Copy content gp:bnfnarrow(K)
 
Copy content magma:NarrowClassGroup(K);
 

Unit group

Copy content comment:Unit group
 
Copy content sage:UK = K.unit_group()
 
Copy content magma:UK, fUK := UnitGroup(K);
 
Copy content oscar:UK, fUK = unit_group(OK)
 
Rank:  $9$
Copy content comment:Unit rank
 
Copy content sage:UK.rank()
 
Copy content gp:K.fu
 
Copy content magma:UnitRank(K);
 
Copy content oscar:rank(UK)
 
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
Copy content comment:Generator for roots of unity
 
Copy content sage:UK.torsion_generator()
 
Copy content gp:K.tu[2]
 
Copy content magma:K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
Copy content oscar:torsion_units_generator(OK)
 
Fundamental units:   $\frac{1}{4}a^{15}-\frac{1}{4}a^{10}+\frac{1}{4}a^{5}+\frac{3}{4}$, $\frac{1}{20}a^{19}-\frac{1}{10}a^{18}-\frac{1}{20}a^{17}+\frac{1}{20}a^{16}-\frac{1}{10}a^{15}-\frac{1}{20}a^{14}+\frac{1}{10}a^{13}+\frac{3}{20}a^{12}-\frac{1}{20}a^{11}+\frac{1}{10}a^{10}+\frac{1}{20}a^{9}-\frac{3}{10}a^{8}+\frac{7}{20}a^{7}+\frac{1}{20}a^{6}-\frac{1}{10}a^{5}+\frac{7}{20}a^{4}+\frac{3}{10}a^{3}+\frac{3}{20}a^{2}-\frac{1}{20}a+\frac{3}{10}$, $\frac{3}{20}a^{18}-\frac{1}{10}a^{17}-\frac{3}{20}a^{16}+\frac{1}{5}a^{14}-\frac{1}{20}a^{13}-\frac{1}{5}a^{12}+\frac{1}{4}a^{11}+\frac{1}{10}a^{10}-\frac{2}{5}a^{9}+\frac{3}{20}a^{8}+\frac{1}{2}a^{7}+\frac{1}{20}a^{6}-\frac{1}{5}a^{5}+\frac{1}{5}a^{4}+\frac{3}{4}a^{3}-\frac{3}{5}a^{2}-\frac{7}{20}a+\frac{11}{10}$, $\frac{1}{20}a^{19}-\frac{1}{20}a^{18}+\frac{1}{20}a^{17}+\frac{1}{10}a^{16}-\frac{1}{10}a^{15}-\frac{3}{20}a^{14}+\frac{3}{20}a^{13}+\frac{1}{20}a^{12}-\frac{3}{10}a^{11}-\frac{1}{5}a^{10}+\frac{9}{20}a^{9}+\frac{3}{20}a^{8}-\frac{3}{20}a^{7}-\frac{1}{10}a^{6}+\frac{1}{10}a^{5}-\frac{11}{20}a^{4}-\frac{9}{20}a^{3}+\frac{9}{20}a^{2}+\frac{3}{10}a-\frac{2}{5}$, $\frac{1}{10}a^{19}-\frac{3}{20}a^{18}+\frac{3}{20}a^{17}-\frac{1}{20}a^{16}-\frac{1}{5}a^{15}+\frac{3}{10}a^{14}-\frac{1}{20}a^{13}-\frac{3}{20}a^{12}+\frac{3}{20}a^{11}-\frac{1}{10}a^{10}+\frac{1}{10}a^{9}+\frac{1}{20}a^{8}-\frac{1}{20}a^{7}-\frac{1}{20}a^{6}-\frac{1}{5}a^{5}-\frac{1}{10}a^{4}+\frac{7}{20}a^{3}-\frac{3}{20}a^{2}+\frac{3}{20}a-\frac{3}{10}$, $\frac{1}{20}a^{19}+\frac{1}{20}a^{18}+\frac{1}{20}a^{17}-\frac{1}{10}a^{16}-\frac{1}{10}a^{15}+\frac{3}{20}a^{14}+\frac{3}{20}a^{13}-\frac{1}{20}a^{12}-\frac{3}{10}a^{11}+\frac{1}{5}a^{10}+\frac{9}{20}a^{9}-\frac{3}{20}a^{8}-\frac{3}{20}a^{7}+\frac{1}{10}a^{6}+\frac{1}{10}a^{5}+\frac{11}{20}a^{4}-\frac{9}{20}a^{3}-\frac{9}{20}a^{2}+\frac{3}{10}a+\frac{2}{5}$, $\frac{1}{20}a^{19}+\frac{3}{20}a^{18}+\frac{1}{10}a^{17}+\frac{1}{20}a^{16}+\frac{3}{20}a^{15}-\frac{1}{20}a^{14}+\frac{1}{20}a^{13}-\frac{1}{10}a^{12}-\frac{1}{20}a^{11}-\frac{3}{20}a^{10}-\frac{7}{20}a^{9}-\frac{1}{20}a^{8}+\frac{1}{10}a^{7}+\frac{1}{20}a^{6}-\frac{1}{20}a^{5}+\frac{7}{20}a^{4}+\frac{1}{20}a^{3}-\frac{1}{10}a^{2}+\frac{7}{20}a+\frac{1}{20}$, $\frac{1}{20}a^{17}-\frac{1}{10}a^{13}-\frac{1}{4}a^{12}+\frac{1}{5}a^{9}+\frac{1}{4}a^{7}-\frac{2}{5}a^{5}-\frac{1}{2}a^{3}+\frac{3}{4}a^{2}-\frac{1}{5}a+1$, $\frac{1}{5}a^{16}+\frac{1}{10}a^{12}+\frac{1}{2}a^{10}-\frac{1}{5}a^{8}+\frac{2}{5}a^{4}-\frac{1}{2}a^{2}-\frac{3}{10}$ Copy content Toggle raw display (assuming GRH)
Copy content comment:Fundamental units
 
Copy content sage:UK.fundamental_units()
 
Copy content gp:K.fu
 
Copy content magma:[K|fUK(g): g in Generators(UK)];
 
Copy content oscar:[K(fUK(a)) for a in gens(UK)]
 
Regulator:  \( 866342.344588 \) (assuming GRH)
Copy content comment:Regulator
 
Copy content sage:K.regulator()
 
Copy content gp:K.reg
 
Copy content magma:Regulator(K);
 
Copy content oscar:regulator(K)
 

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 866342.344588 \cdot 1}{2\cdot\sqrt{2849723796343285750000000000}}\cr\approx \mathstrut & 0.77813839627 \end{aligned}\] (assuming GRH)

Copy content comment:Analytic class number formula
 
Copy content sage:# self-contained SageMath code snippet to compute the analytic class number formula x = polygen(QQ); K.<a> = NumberField(x^20 + 7) 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))))
 
Copy content gp:\\ self-contained Pari/GP code snippet to compute the analytic class number formula K = bnfinit(x^20 + 7, 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)))]
 
Copy content magma:/* self-contained Magma code snippet to compute the analytic class number formula */ Qx<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 + 7); 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)));
 
Copy content oscar:# self-contained Oscar code snippet to compute the analytic class number formula Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 + 7); 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

$D_4\times F_5$ (as 20T42):

Copy content comment:Galois group
 
Copy content sage:K.galois_group()
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:GaloisGroup(K);
 
Copy content oscar:G, Gtx = galois_group(K); degree(K) > 1 ? (G, transitive_group_identification(G)) : (G, nothing)
 
A solvable group of order 160
The 25 conjugacy class representatives for $D_4\times F_5$
Character table for $D_4\times F_5$

Intermediate fields

\(\Q(\sqrt{-7}) \), \(\Q(\sqrt{-14 -6 \sqrt{-7}})\), 5.1.300125.1, 10.0.630525109375.1

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Copy content comment:Intermediate fields
 
Copy content sage:K.subfields()[1:-1]
 
Copy content gp:L = nfsubfields(K); L[2..length(L)]
 
Copy content magma:L := Subfields(K); L[2..#L];
 
Copy content oscar:subfields(K)[2:end-1]
 

Sibling fields

Degree 20 siblings: data not computed
Degree 40 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 ${\href{/padicField/3.4.0.1}{4} }^{4}{,}\,{\href{/padicField/3.2.0.1}{2} }^{2}$ R R ${\href{/padicField/11.10.0.1}{10} }{,}\,{\href{/padicField/11.5.0.1}{5} }^{2}$ ${\href{/padicField/13.4.0.1}{4} }^{5}$ ${\href{/padicField/17.4.0.1}{4} }^{5}$ ${\href{/padicField/19.2.0.1}{2} }^{10}$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }{,}\,{\href{/padicField/23.1.0.1}{1} }^{2}$ ${\href{/padicField/29.2.0.1}{2} }^{10}$ ${\href{/padicField/31.10.0.1}{10} }^{2}$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }^{2}$ $20$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }{,}\,{\href{/padicField/43.1.0.1}{1} }^{2}$ ${\href{/padicField/47.4.0.1}{4} }^{4}{,}\,{\href{/padicField/47.2.0.1}{2} }^{2}$ ${\href{/padicField/53.4.0.1}{4} }^{4}{,}\,{\href{/padicField/53.1.0.1}{1} }^{4}$ ${\href{/padicField/59.2.0.1}{2} }^{10}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

Copy content comment:Frobenius cycle types
 
Copy content sage:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Sage: p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
Copy content gp:\\ to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Pari: p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
Copy content magma:// to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Magma: p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
Copy content oscar:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_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 2.2.1.0a1.1$x^{2} + x + 1$$1$$2$$0$$C_2$$$[\ ]^{2}$$
2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.4.1.0a1.1$x^{4} + x + 1$$1$$4$$0$$C_4$$$[\ ]^{4}$$
2.4.1.0a1.1$x^{4} + x + 1$$1$$4$$0$$C_4$$$[\ ]^{4}$$
2.4.2.8a1.1$x^{8} + 2 x^{5} + 4 x^{4} + x^{2} + 4 x + 5$$2$$4$$8$$C_4\times C_2$$$[2]^{4}$$
\(5\) Copy content Toggle raw display 5.4.1.0a1.1$x^{4} + 4 x^{2} + 4 x + 2$$1$$4$$0$$C_4$$$[\ ]^{4}$$
5.4.4.12a1.4$x^{16} + 16 x^{14} + 16 x^{13} + 104 x^{12} + 192 x^{11} + 448 x^{10} + 864 x^{9} + 1432 x^{8} + 2048 x^{7} + 2624 x^{6} + 2752 x^{5} + 2208 x^{4} + 1280 x^{3} + 512 x^{2} + 128 x + 21$$4$$4$$12$$C_4^2$$$[\ ]_{4}^{4}$$
\(7\) Copy content Toggle raw display 7.1.20.19a1.1$x^{20} + 7$$20$$1$$19$20T18$$[\ ]_{20}^{4}$$

Spectrum of ring of integers

(0)(0)(2)(3)(5)(7)(11)(13)(17)(19)(23)(29)(31)(37)(41)(43)(47)(53)(59)