Properties

Label 20.0.389...125.1
Degree $20$
Signature $(0, 10)$
Discriminant $3.900\times 10^{38}$
Root discriminant \(85.03\)
Ramified primes $3,5,7$
Class number $2160$ (GRH)
Class group [2, 2, 540] (GRH)
Galois group $C_{20}:C_4$ (as 20T18)

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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 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605)
 
Copy content gp:K = bnfinit(y^20 + 35*y^18 - 35*y^17 + 560*y^16 - 644*y^15 + 3500*y^14 - 7980*y^13 + 4900*y^12 - 81165*y^11 - 60326*y^10 - 364070*y^9 + 44415*y^8 + 216755*y^7 + 3244640*y^6 + 6448680*y^5 + 13887370*y^4 + 18300310*y^3 + 23635780*y^2 + 19930925*y + 9992605, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605)
 

\( x^{20} + 35 x^{18} - 35 x^{17} + 560 x^{16} - 644 x^{15} + 3500 x^{14} - 7980 x^{13} + 4900 x^{12} + \cdots + 9992605 \) 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:   \(389961449903647873889687061309814453125\) \(\medspace = 3^{15}\cdot 5^{22}\cdot 7^{19}\) 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:  \(85.03\)
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:  not computed
Ramified primes:   \(3\), \(5\), \(7\) 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:  \(\Q(\sqrt{21}) \)
$\Aut(K/\Q)$:   $C_2$
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 a CM field.
Reflex fields:  unavailable$^{512}$

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $\frac{1}{2}a^{11}-\frac{1}{2}a^{8}-\frac{1}{2}a^{7}-\frac{1}{2}a^{5}-\frac{1}{2}a^{3}-\frac{1}{2}a^{2}-\frac{1}{2}a-\frac{1}{2}$, $\frac{1}{2}a^{12}-\frac{1}{2}a^{9}-\frac{1}{2}a^{8}-\frac{1}{2}a^{6}-\frac{1}{2}a^{4}-\frac{1}{2}a^{3}-\frac{1}{2}a^{2}-\frac{1}{2}a$, $\frac{1}{2}a^{13}-\frac{1}{2}a^{10}-\frac{1}{2}a^{9}-\frac{1}{2}a^{7}-\frac{1}{2}a^{5}-\frac{1}{2}a^{4}-\frac{1}{2}a^{3}-\frac{1}{2}a^{2}$, $\frac{1}{2}a^{14}-\frac{1}{2}a^{10}-\frac{1}{2}a^{7}-\frac{1}{2}a^{6}-\frac{1}{2}a^{4}-\frac{1}{2}a^{2}-\frac{1}{2}a-\frac{1}{2}$, $\frac{1}{2}a^{15}-\frac{1}{2}$, $\frac{1}{2}a^{16}-\frac{1}{2}a$, $\frac{1}{2}a^{17}-\frac{1}{2}a^{2}$, $\frac{1}{4}a^{18}-\frac{1}{4}a^{17}-\frac{1}{4}a^{16}-\frac{1}{4}a^{15}-\frac{1}{4}a^{13}-\frac{1}{4}a^{12}+\frac{1}{4}a^{10}-\frac{1}{2}a^{9}-\frac{1}{4}a^{8}-\frac{1}{4}a^{7}+\frac{1}{4}a^{6}-\frac{1}{4}a^{5}-\frac{1}{2}a^{4}+\frac{1}{4}a^{3}-\frac{1}{4}a^{2}+\frac{1}{4}$, $\frac{1}{93\cdots 36}a^{19}-\frac{29\cdots 55}{93\cdots 36}a^{18}+\frac{42\cdots 75}{93\cdots 36}a^{17}-\frac{11\cdots 21}{93\cdots 36}a^{16}-\frac{31\cdots 93}{23\cdots 59}a^{15}-\frac{52\cdots 71}{93\cdots 36}a^{14}+\frac{12\cdots 67}{93\cdots 36}a^{13}+\frac{17\cdots 82}{23\cdots 59}a^{12}-\frac{18\cdots 21}{93\cdots 36}a^{11}+\frac{48\cdots 22}{23\cdots 59}a^{10}+\frac{56\cdots 27}{93\cdots 36}a^{9}+\frac{45\cdots 33}{93\cdots 36}a^{8}-\frac{37\cdots 47}{93\cdots 36}a^{7}+\frac{23\cdots 93}{93\cdots 36}a^{6}+\frac{35\cdots 38}{23\cdots 59}a^{5}+\frac{13\cdots 03}{93\cdots 36}a^{4}-\frac{23\cdots 97}{93\cdots 36}a^{3}+\frac{10\cdots 01}{23\cdots 59}a^{2}+\frac{28\cdots 89}{93\cdots 36}a+\frac{34\cdots 36}{23\cdots 59}$ 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:  No
Index:  Not computed
Inessential primes:  $2$

Class group and class number

Ideal class group:  $C_{2}\times C_{2}\times C_{540}$, which has order $2160$ (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:  $C_{2}\times C_{2}\times C_{540}$, which has order $2160$ (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);
 
Relative class number:   data not computed (assuming GRH)

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:   $\frac{27\cdots 61}{21\cdots 92}a^{19}-\frac{21\cdots 92}{54\cdots 23}a^{18}-\frac{22\cdots 02}{54\cdots 23}a^{17}-\frac{47\cdots 31}{54\cdots 23}a^{16}-\frac{10\cdots 55}{21\cdots 92}a^{15}-\frac{28\cdots 43}{21\cdots 92}a^{14}-\frac{56\cdots 11}{10\cdots 46}a^{13}-\frac{84\cdots 67}{21\cdots 92}a^{12}+\frac{78\cdots 51}{21\cdots 92}a^{11}+\frac{10\cdots 53}{21\cdots 92}a^{10}+\frac{97\cdots 87}{21\cdots 92}a^{9}+\frac{31\cdots 75}{10\cdots 46}a^{8}+\frac{66\cdots 73}{54\cdots 23}a^{7}-\frac{10\cdots 25}{54\cdots 23}a^{6}-\frac{11\cdots 29}{21\cdots 92}a^{5}-\frac{38\cdots 23}{21\cdots 92}a^{4}-\frac{17\cdots 67}{54\cdots 23}a^{3}-\frac{10\cdots 93}{21\cdots 92}a^{2}-\frac{10\cdots 95}{21\cdots 92}a-\frac{14\cdots 77}{21\cdots 92}$, $\frac{28\cdots 93}{21\cdots 92}a^{19}-\frac{13\cdots 02}{54\cdots 23}a^{18}-\frac{39\cdots 03}{10\cdots 46}a^{17}-\frac{24\cdots 32}{54\cdots 23}a^{16}-\frac{77\cdots 93}{21\cdots 92}a^{15}-\frac{19\cdots 13}{21\cdots 92}a^{14}+\frac{59\cdots 61}{54\cdots 23}a^{13}-\frac{60\cdots 93}{21\cdots 92}a^{12}+\frac{62\cdots 27}{21\cdots 92}a^{11}+\frac{11\cdots 73}{21\cdots 92}a^{10}+\frac{53\cdots 35}{21\cdots 92}a^{9}+\frac{77\cdots 48}{54\cdots 23}a^{8}+\frac{17\cdots 13}{54\cdots 23}a^{7}-\frac{87\cdots 24}{54\cdots 23}a^{6}-\frac{89\cdots 15}{21\cdots 92}a^{5}-\frac{21\cdots 29}{21\cdots 92}a^{4}-\frac{81\cdots 99}{54\cdots 23}a^{3}-\frac{47\cdots 17}{21\cdots 92}a^{2}-\frac{42\cdots 55}{21\cdots 92}a-\frac{21\cdots 33}{21\cdots 92}$, $\frac{14\cdots 79}{21\cdots 92}a^{19}-\frac{72\cdots 98}{54\cdots 23}a^{18}+\frac{12\cdots 06}{54\cdots 23}a^{17}-\frac{35\cdots 87}{54\cdots 23}a^{16}+\frac{92\cdots 87}{21\cdots 92}a^{15}-\frac{22\cdots 31}{21\cdots 92}a^{14}+\frac{33\cdots 21}{10\cdots 46}a^{13}-\frac{16\cdots 15}{21\cdots 92}a^{12}+\frac{20\cdots 29}{21\cdots 92}a^{11}-\frac{10\cdots 91}{21\cdots 92}a^{10}+\frac{43\cdots 91}{21\cdots 92}a^{9}-\frac{72\cdots 20}{54\cdots 23}a^{8}+\frac{18\cdots 81}{10\cdots 46}a^{7}+\frac{58\cdots 58}{54\cdots 23}a^{6}+\frac{22\cdots 37}{21\cdots 92}a^{5}+\frac{40\cdots 49}{21\cdots 92}a^{4}+\frac{30\cdots 23}{10\cdots 46}a^{3}+\frac{85\cdots 61}{21\cdots 92}a^{2}+\frac{86\cdots 63}{21\cdots 92}a+\frac{31\cdots 67}{21\cdots 92}$, $\frac{30\cdots 97}{10\cdots 46}a^{19}+\frac{12\cdots 35}{21\cdots 92}a^{18}+\frac{22\cdots 17}{21\cdots 92}a^{17}-\frac{19\cdots 83}{21\cdots 92}a^{16}+\frac{36\cdots 97}{21\cdots 92}a^{15}-\frac{10\cdots 46}{54\cdots 23}a^{14}+\frac{23\cdots 69}{21\cdots 92}a^{13}-\frac{53\cdots 79}{21\cdots 92}a^{12}+\frac{55\cdots 22}{54\cdots 23}a^{11}-\frac{50\cdots 81}{21\cdots 92}a^{10}-\frac{26\cdots 07}{10\cdots 46}a^{9}-\frac{22\cdots 59}{21\cdots 92}a^{8}+\frac{57\cdots 45}{21\cdots 92}a^{7}+\frac{36\cdots 03}{21\cdots 92}a^{6}+\frac{19\cdots 21}{21\cdots 92}a^{5}+\frac{12\cdots 36}{54\cdots 23}a^{4}+\frac{80\cdots 59}{21\cdots 92}a^{3}+\frac{12\cdots 73}{21\cdots 92}a^{2}+\frac{28\cdots 16}{54\cdots 23}a+\frac{12\cdots 87}{21\cdots 92}$, $\frac{50\cdots 71}{21\cdots 92}a^{19}+\frac{29\cdots 47}{21\cdots 92}a^{18}-\frac{17\cdots 33}{21\cdots 92}a^{17}+\frac{27\cdots 27}{21\cdots 92}a^{16}-\frac{68\cdots 64}{54\cdots 23}a^{15}+\frac{43\cdots 99}{21\cdots 92}a^{14}-\frac{16\cdots 43}{21\cdots 92}a^{13}+\frac{20\cdots 75}{10\cdots 46}a^{12}-\frac{20\cdots 89}{21\cdots 92}a^{11}+\frac{84\cdots 28}{54\cdots 23}a^{10}+\frac{19\cdots 67}{21\cdots 92}a^{9}+\frac{11\cdots 03}{21\cdots 92}a^{8}-\frac{72\cdots 35}{21\cdots 92}a^{7}-\frac{26\cdots 79}{21\cdots 92}a^{6}-\frac{59\cdots 35}{10\cdots 46}a^{5}-\frac{23\cdots 99}{21\cdots 92}a^{4}-\frac{35\cdots 75}{21\cdots 92}a^{3}-\frac{24\cdots 35}{10\cdots 46}a^{2}-\frac{46\cdots 83}{21\cdots 92}a-\frac{22\cdots 21}{10\cdots 46}$, $\frac{20\cdots 15}{54\cdots 23}a^{19}+\frac{43\cdots 69}{21\cdots 92}a^{18}-\frac{28\cdots 15}{21\cdots 92}a^{17}+\frac{41\cdots 15}{21\cdots 92}a^{16}-\frac{45\cdots 55}{21\cdots 92}a^{15}+\frac{17\cdots 93}{54\cdots 23}a^{14}-\frac{27\cdots 47}{21\cdots 92}a^{13}+\frac{66\cdots 13}{21\cdots 92}a^{12}-\frac{17\cdots 67}{10\cdots 46}a^{11}+\frac{56\cdots 07}{21\cdots 92}a^{10}+\frac{19\cdots 63}{10\cdots 46}a^{9}+\frac{20\cdots 51}{21\cdots 92}a^{8}-\frac{59\cdots 49}{21\cdots 92}a^{7}-\frac{38\cdots 09}{21\cdots 92}a^{6}-\frac{19\cdots 25}{21\cdots 92}a^{5}-\frac{22\cdots 69}{10\cdots 46}a^{4}-\frac{72\cdots 05}{21\cdots 92}a^{3}-\frac{10\cdots 41}{21\cdots 92}a^{2}-\frac{25\cdots 19}{54\cdots 23}a-\frac{97\cdots 27}{21\cdots 92}$, $\frac{87\cdots 37}{21\cdots 92}a^{19}-\frac{50\cdots 29}{21\cdots 92}a^{18}+\frac{29\cdots 71}{21\cdots 92}a^{17}-\frac{45\cdots 89}{21\cdots 92}a^{16}+\frac{11\cdots 62}{54\cdots 23}a^{15}-\frac{70\cdots 01}{21\cdots 92}a^{14}+\frac{24\cdots 85}{21\cdots 92}a^{13}-\frac{32\cdots 25}{10\cdots 46}a^{12}+\frac{21\cdots 11}{21\cdots 92}a^{11}-\frac{13\cdots 35}{54\cdots 23}a^{10}-\frac{35\cdots 85}{21\cdots 92}a^{9}-\frac{16\cdots 33}{21\cdots 92}a^{8}+\frac{12\cdots 93}{21\cdots 92}a^{7}+\frac{49\cdots 05}{21\cdots 92}a^{6}+\frac{99\cdots 03}{10\cdots 46}a^{5}+\frac{38\cdots 97}{21\cdots 92}a^{4}+\frac{56\cdots 53}{21\cdots 92}a^{3}+\frac{39\cdots 07}{10\cdots 46}a^{2}+\frac{73\cdots 97}{21\cdots 92}a+\frac{91\cdots 11}{10\cdots 46}$, $\frac{18\cdots 43}{21\cdots 92}a^{19}+\frac{32\cdots 61}{21\cdots 92}a^{18}-\frac{67\cdots 67}{21\cdots 92}a^{17}+\frac{17\cdots 27}{21\cdots 92}a^{16}-\frac{60\cdots 75}{10\cdots 46}a^{15}+\frac{28\cdots 67}{21\cdots 92}a^{14}-\frac{89\cdots 09}{21\cdots 92}a^{13}+\frac{11\cdots 27}{10\cdots 46}a^{12}-\frac{26\cdots 73}{21\cdots 92}a^{11}+\frac{69\cdots 45}{10\cdots 46}a^{10}-\frac{36\cdots 23}{21\cdots 92}a^{9}+\frac{44\cdots 55}{21\cdots 92}a^{8}-\frac{48\cdots 85}{21\cdots 92}a^{7}-\frac{40\cdots 03}{21\cdots 92}a^{6}-\frac{84\cdots 33}{54\cdots 23}a^{5}-\frac{60\cdots 61}{21\cdots 92}a^{4}-\frac{89\cdots 15}{21\cdots 92}a^{3}-\frac{60\cdots 63}{10\cdots 46}a^{2}-\frac{12\cdots 43}{21\cdots 92}a-\frac{12\cdots 87}{54\cdots 23}$, $\frac{41\cdots 03}{21\cdots 92}a^{19}+\frac{37\cdots 77}{10\cdots 46}a^{18}+\frac{70\cdots 53}{10\cdots 46}a^{17}-\frac{34\cdots 22}{54\cdots 23}a^{16}+\frac{21\cdots 97}{21\cdots 92}a^{15}-\frac{25\cdots 15}{21\cdots 92}a^{14}+\frac{58\cdots 49}{10\cdots 46}a^{13}-\frac{31\cdots 95}{21\cdots 92}a^{12}-\frac{80\cdots 25}{21\cdots 92}a^{11}-\frac{28\cdots 27}{21\cdots 92}a^{10}-\frac{31\cdots 73}{21\cdots 92}a^{9}-\frac{48\cdots 77}{10\cdots 46}a^{8}+\frac{16\cdots 38}{54\cdots 23}a^{7}+\frac{91\cdots 35}{54\cdots 23}a^{6}+\frac{12\cdots 95}{21\cdots 92}a^{5}+\frac{22\cdots 01}{21\cdots 92}a^{4}+\frac{15\cdots 49}{10\cdots 46}a^{3}+\frac{39\cdots 13}{21\cdots 92}a^{2}+\frac{35\cdots 57}{21\cdots 92}a+\frac{15\cdots 23}{21\cdots 92}$ 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:  \( 632150489.6787821 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 632150489.6787821 \cdot 2160}{2\cdot\sqrt{389961449903647873889687061309814453125}}\cr\approx \mathstrut & 3.31537058171741 \end{aligned}\] (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 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605) 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 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605, 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 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605); 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 + 35*x^18 - 35*x^17 + 560*x^16 - 644*x^15 + 3500*x^14 - 7980*x^13 + 4900*x^12 - 81165*x^11 - 60326*x^10 - 364070*x^9 + 44415*x^8 + 216755*x^7 + 3244640*x^6 + 6448680*x^5 + 13887370*x^4 + 18300310*x^3 + 23635780*x^2 + 19930925*x + 9992605); 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

$C_{20}:C_4$ (as 20T18):

Copy content comment:Galois group
 
Copy content sage:K.galois_group()
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:G = 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 80
The 14 conjugacy class representatives for $C_{20}:C_4$
Character table for $C_{20}:C_4$

Intermediate fields

\(\Q(\sqrt{105}) \), \(\Q(\sqrt{-21 +2 \sqrt{105}})\), 5.5.67528125.1, deg 10

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 sibling: data not computed
Degree 40 siblings: data not computed
Minimal sibling: 20.0.77992289980729574777937412261962890625.1

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type ${\href{/padicField/2.4.0.1}{4} }^{4}{,}\,{\href{/padicField/2.2.0.1}{2} }{,}\,{\href{/padicField/2.1.0.1}{1} }^{2}$ R R R ${\href{/padicField/11.4.0.1}{4} }^{5}$ ${\href{/padicField/13.4.0.1}{4} }^{4}{,}\,{\href{/padicField/13.2.0.1}{2} }{,}\,{\href{/padicField/13.1.0.1}{1} }^{2}$ ${\href{/padicField/17.4.0.1}{4} }^{4}{,}\,{\href{/padicField/17.2.0.1}{2} }^{2}$ ${\href{/padicField/19.4.0.1}{4} }^{5}$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }{,}\,{\href{/padicField/23.1.0.1}{1} }^{2}$ $20$ $20$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }^{2}$ ${\href{/padicField/41.2.0.1}{2} }^{8}{,}\,{\href{/padicField/41.1.0.1}{1} }^{4}$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }^{2}$ ${\href{/padicField/47.4.0.1}{4} }^{4}{,}\,{\href{/padicField/47.2.0.1}{2} }^{2}$ ${\href{/padicField/53.4.0.1}{4} }^{4}{,}\,{\href{/padicField/53.2.0.1}{2} }{,}\,{\href{/padicField/53.1.0.1}{1} }^{2}$ ${\href{/padicField/59.5.0.1}{5} }^{4}$

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
\(3\) Copy content Toggle raw display 3.4.3.1$x^{4} + 3$$4$$1$$3$$D_{4}$$$[\ ]_{4}^{2}$$
3.16.12.1$x^{16} + 8 x^{15} + 24 x^{14} + 32 x^{13} + 24 x^{12} + 48 x^{11} + 96 x^{10} + 64 x^{9} + 24 x^{8} + 96 x^{7} + 96 x^{6} + 32 x^{4} + 64 x^{3} + 19$$4$$4$$12$$C_4:C_4$$$[\ ]_{4}^{4}$$
\(5\) Copy content Toggle raw display 5.10.11.1$x^{10} + 20 x^{2} + 5$$10$$1$$11$$F_5$$$[\frac{5}{4}]_{4}$$
5.10.11.1$x^{10} + 20 x^{2} + 5$$10$$1$$11$$F_5$$$[\frac{5}{4}]_{4}$$
\(7\) Copy content Toggle raw display 7.20.19.2$x^{20} + 21$$20$$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)