Properties

Label 20.0.414...992.1
Degree $20$
Signature $(0, 10)$
Discriminant $4.142\times 10^{48}$
Root discriminant \(269.69\)
Ramified primes $2,17,53$
Class number $6407424$ (GRH)
Class group [2, 2, 6, 12, 22248] (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 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329)
 
Copy content gp:K = bnfinit(y^20 - 4*y^19 + 177*y^18 - 4*y^17 + 8449*y^16 + 23822*y^15 + 168540*y^14 + 596526*y^13 + 2612317*y^12 + 7067238*y^11 + 38130743*y^10 + 75736410*y^9 + 321304814*y^8 + 864149074*y^7 + 1787066994*y^6 + 245640690*y^5 + 6843858589*y^4 - 4594563420*y^3 + 14977761454*y^2 - 24323038390*y + 15554125329, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329)
 

\( x^{20} - 4 x^{19} + 177 x^{18} - 4 x^{17} + 8449 x^{16} + 23822 x^{15} + 168540 x^{14} + \cdots + 15554125329 \) 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:   \(4141864704128763454804479176602577540516903124992\) \(\medspace = 2^{20}\cdot 17^{15}\cdot 53^{14}\) 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:  \(269.69\)
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:  $2\cdot 17^{3/4}53^{3/4}\approx 328.90735776316194$
Ramified primes:   \(2\), \(17\), \(53\) 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:  \(\Q(\sqrt{17}) \)
$\Aut(K/\Q)$:   $C_2$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $\frac{1}{3}a^{15}-\frac{1}{3}a^{14}+\frac{1}{3}a^{13}-\frac{1}{3}a^{12}+\frac{1}{3}a^{11}+\frac{1}{3}a^{10}+\frac{1}{3}a^{9}+\frac{1}{3}a^{8}+\frac{1}{3}a^{7}+\frac{1}{3}a^{6}+\frac{1}{3}a^{4}-\frac{1}{3}a^{3}+\frac{1}{3}a^{2}-\frac{1}{3}a$, $\frac{1}{9}a^{16}+\frac{1}{9}a^{15}-\frac{4}{9}a^{14}-\frac{2}{9}a^{13}-\frac{4}{9}a^{12}-\frac{1}{3}a^{11}-\frac{1}{3}a^{8}-\frac{1}{3}a^{7}-\frac{4}{9}a^{6}+\frac{1}{9}a^{5}+\frac{4}{9}a^{4}-\frac{4}{9}a^{3}+\frac{1}{9}a^{2}-\frac{2}{9}a+\frac{1}{3}$, $\frac{1}{9}a^{17}+\frac{1}{9}a^{15}-\frac{4}{9}a^{14}+\frac{4}{9}a^{13}+\frac{4}{9}a^{12}-\frac{1}{3}a^{10}+\frac{1}{3}a^{9}-\frac{1}{3}a^{8}-\frac{4}{9}a^{7}+\frac{2}{9}a^{6}+\frac{1}{3}a^{5}-\frac{2}{9}a^{4}-\frac{1}{9}a^{3}+\frac{1}{3}a^{2}-\frac{1}{9}a-\frac{1}{3}$, $\frac{1}{37449}a^{18}-\frac{1754}{37449}a^{17}-\frac{227}{37449}a^{16}+\frac{183}{1387}a^{15}-\frac{2605}{12483}a^{14}-\frac{9034}{37449}a^{13}-\frac{15317}{37449}a^{12}-\frac{5735}{12483}a^{11}+\frac{3104}{12483}a^{10}-\frac{4366}{12483}a^{9}-\frac{16831}{37449}a^{8}+\frac{8527}{37449}a^{7}-\frac{17149}{37449}a^{6}-\frac{18146}{37449}a^{5}+\frac{436}{4161}a^{4}+\frac{3329}{37449}a^{3}-\frac{850}{37449}a^{2}+\frac{3335}{37449}a+\frac{3926}{12483}$, $\frac{1}{36\cdots 33}a^{19}-\frac{11\cdots 45}{12\cdots 11}a^{18}+\frac{55\cdots 30}{12\cdots 11}a^{17}+\frac{74\cdots 45}{36\cdots 33}a^{16}+\frac{36\cdots 36}{12\cdots 11}a^{15}-\frac{68\cdots 90}{36\cdots 33}a^{14}-\frac{65\cdots 62}{36\cdots 33}a^{13}+\frac{13\cdots 99}{36\cdots 33}a^{12}-\frac{13\cdots 17}{12\cdots 11}a^{11}-\frac{11\cdots 40}{40\cdots 37}a^{10}-\frac{14\cdots 73}{36\cdots 33}a^{9}-\frac{14\cdots 31}{36\cdots 33}a^{8}-\frac{49\cdots 81}{36\cdots 33}a^{7}-\frac{17\cdots 39}{36\cdots 33}a^{6}+\frac{81\cdots 10}{36\cdots 33}a^{5}-\frac{12\cdots 36}{36\cdots 33}a^{4}+\frac{13\cdots 14}{40\cdots 37}a^{3}-\frac{29\cdots 85}{12\cdots 11}a^{2}-\frac{13\cdots 96}{36\cdots 33}a+\frac{49\cdots 25}{12\cdots 11}$ 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:  $C_{2}\times C_{2}\times C_{6}\times C_{12}\times C_{22248}$, which has order $6407424$ (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:  $C_{2}\times C_{2}\times C_{6}\times C_{12}\times C_{22248}$, which has order $6407424$ (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:   $1601856$ (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:   $\frac{21\cdots 09}{11\cdots 59}a^{19}-\frac{52\cdots 50}{50\cdots 61}a^{18}+\frac{43\cdots 15}{12\cdots 51}a^{17}-\frac{46\cdots 57}{11\cdots 59}a^{16}+\frac{58\cdots 14}{36\cdots 53}a^{15}+\frac{32\cdots 05}{11\cdots 59}a^{14}+\frac{25\cdots 11}{11\cdots 59}a^{13}+\frac{88\cdots 89}{11\cdots 59}a^{12}+\frac{11\cdots 26}{36\cdots 53}a^{11}+\frac{85\cdots 15}{12\cdots 51}a^{10}+\frac{57\cdots 13}{11\cdots 59}a^{9}+\frac{55\cdots 27}{11\cdots 59}a^{8}+\frac{37\cdots 50}{11\cdots 59}a^{7}+\frac{11\cdots 03}{11\cdots 59}a^{6}+\frac{55\cdots 00}{11\cdots 59}a^{5}-\frac{36\cdots 98}{11\cdots 59}a^{4}+\frac{57\cdots 90}{36\cdots 53}a^{3}-\frac{76\cdots 28}{36\cdots 53}a^{2}+\frac{12\cdots 95}{11\cdots 59}a-\frac{70\cdots 13}{36\cdots 53}$, $\frac{13\cdots 98}{11\cdots 59}a^{19}-\frac{30\cdots 82}{36\cdots 53}a^{18}+\frac{86\cdots 45}{36\cdots 53}a^{17}-\frac{65\cdots 54}{11\cdots 59}a^{16}+\frac{40\cdots 14}{36\cdots 53}a^{15}+\frac{12\cdots 59}{11\cdots 59}a^{14}+\frac{17\cdots 50}{11\cdots 59}a^{13}+\frac{22\cdots 89}{11\cdots 59}a^{12}+\frac{74\cdots 49}{36\cdots 53}a^{11}+\frac{24\cdots 87}{12\cdots 51}a^{10}+\frac{37\cdots 45}{11\cdots 59}a^{9}-\frac{71\cdots 13}{11\cdots 59}a^{8}+\frac{30\cdots 24}{11\cdots 59}a^{7}+\frac{18\cdots 22}{11\cdots 59}a^{6}+\frac{11\cdots 97}{11\cdots 59}a^{5}-\frac{43\cdots 84}{11\cdots 59}a^{4}+\frac{14\cdots 98}{12\cdots 51}a^{3}-\frac{62\cdots 69}{36\cdots 53}a^{2}+\frac{12\cdots 43}{11\cdots 59}a-\frac{33\cdots 61}{36\cdots 53}$, $\frac{18\cdots 41}{36\cdots 53}a^{19}-\frac{75\cdots 56}{36\cdots 53}a^{18}+\frac{34\cdots 95}{36\cdots 53}a^{17}-\frac{34\cdots 49}{12\cdots 51}a^{16}+\frac{62\cdots 10}{12\cdots 51}a^{15}+\frac{58\cdots 53}{50\cdots 61}a^{14}+\frac{42\cdots 53}{36\cdots 53}a^{13}+\frac{47\cdots 59}{12\cdots 51}a^{12}+\frac{20\cdots 30}{12\cdots 51}a^{11}+\frac{56\cdots 45}{12\cdots 51}a^{10}+\frac{93\cdots 81}{36\cdots 53}a^{9}+\frac{20\cdots 48}{36\cdots 53}a^{8}+\frac{10\cdots 44}{36\cdots 53}a^{7}+\frac{18\cdots 19}{36\cdots 53}a^{6}+\frac{60\cdots 46}{12\cdots 51}a^{5}-\frac{27\cdots 48}{36\cdots 53}a^{4}+\frac{21\cdots 36}{36\cdots 53}a^{3}-\frac{24\cdots 09}{36\cdots 53}a^{2}+\frac{20\cdots 29}{12\cdots 51}a-\frac{26\cdots 51}{40\cdots 17}$, $\frac{49\cdots 05}{11\cdots 59}a^{19}-\frac{32\cdots 38}{12\cdots 51}a^{18}+\frac{30\cdots 35}{36\cdots 53}a^{17}-\frac{17\cdots 65}{11\cdots 59}a^{16}+\frac{13\cdots 42}{36\cdots 53}a^{15}+\frac{34\cdots 23}{11\cdots 59}a^{14}+\frac{61\cdots 11}{11\cdots 59}a^{13}+\frac{13\cdots 67}{11\cdots 59}a^{12}+\frac{26\cdots 24}{36\cdots 53}a^{11}+\frac{44\cdots 63}{40\cdots 17}a^{10}+\frac{13\cdots 03}{11\cdots 59}a^{9}+\frac{41\cdots 01}{11\cdots 59}a^{8}+\frac{98\cdots 98}{11\cdots 59}a^{7}+\frac{15\cdots 47}{11\cdots 59}a^{6}+\frac{29\cdots 94}{11\cdots 59}a^{5}-\frac{12\cdots 66}{11\cdots 59}a^{4}+\frac{14\cdots 78}{36\cdots 53}a^{3}-\frac{22\cdots 74}{40\cdots 17}a^{2}+\frac{37\cdots 81}{11\cdots 59}a-\frac{80\cdots 73}{50\cdots 61}$, $\frac{12\cdots 63}{70\cdots 07}a^{19}-\frac{31\cdots 28}{70\cdots 07}a^{18}+\frac{21\cdots 50}{70\cdots 07}a^{17}+\frac{32\cdots 01}{70\cdots 07}a^{16}+\frac{34\cdots 66}{23\cdots 69}a^{15}+\frac{44\cdots 21}{70\cdots 07}a^{14}+\frac{81\cdots 63}{23\cdots 69}a^{13}+\frac{97\cdots 32}{70\cdots 07}a^{12}+\frac{14\cdots 01}{25\cdots 41}a^{11}+\frac{38\cdots 74}{23\cdots 69}a^{10}+\frac{72\cdots 37}{95\cdots 59}a^{9}+\frac{45\cdots 89}{23\cdots 69}a^{8}+\frac{14\cdots 01}{23\cdots 69}a^{7}+\frac{43\cdots 23}{23\cdots 69}a^{6}+\frac{27\cdots 98}{70\cdots 07}a^{5}+\frac{22\cdots 22}{70\cdots 07}a^{4}+\frac{32\cdots 86}{70\cdots 07}a^{3}-\frac{65\cdots 45}{70\cdots 07}a^{2}+\frac{77\cdots 02}{70\cdots 07}a-\frac{41\cdots 01}{23\cdots 69}$, $\frac{67\cdots 57}{11\cdots 59}a^{19}-\frac{15\cdots 28}{12\cdots 51}a^{18}+\frac{36\cdots 71}{36\cdots 53}a^{17}+\frac{27\cdots 37}{11\cdots 59}a^{16}+\frac{15\cdots 00}{36\cdots 53}a^{15}+\frac{32\cdots 89}{11\cdots 59}a^{14}+\frac{82\cdots 41}{11\cdots 59}a^{13}+\frac{81\cdots 98}{11\cdots 59}a^{12}+\frac{34\cdots 44}{36\cdots 53}a^{11}+\frac{39\cdots 90}{40\cdots 17}a^{10}+\frac{16\cdots 63}{11\cdots 59}a^{9}+\frac{11\cdots 98}{11\cdots 59}a^{8}+\frac{12\cdots 54}{11\cdots 59}a^{7}+\frac{16\cdots 36}{15\cdots 83}a^{6}-\frac{13\cdots 64}{11\cdots 59}a^{5}+\frac{57\cdots 67}{11\cdots 59}a^{4}-\frac{38\cdots 02}{36\cdots 53}a^{3}+\frac{19\cdots 98}{13\cdots 39}a^{2}-\frac{12\cdots 97}{11\cdots 59}a+\frac{11\cdots 16}{36\cdots 53}$, $\frac{82\cdots 55}{21\cdots 21}a^{19}+\frac{11\cdots 23}{23\cdots 69}a^{18}-\frac{69\cdots 42}{70\cdots 07}a^{17}+\frac{17\cdots 83}{21\cdots 21}a^{16}+\frac{75\cdots 62}{70\cdots 07}a^{15}+\frac{72\cdots 27}{21\cdots 21}a^{14}+\frac{35\cdots 51}{21\cdots 21}a^{13}+\frac{10\cdots 85}{21\cdots 21}a^{12}+\frac{24\cdots 91}{70\cdots 07}a^{11}+\frac{56\cdots 55}{77\cdots 23}a^{10}+\frac{73\cdots 41}{21\cdots 21}a^{9}+\frac{25\cdots 76}{21\cdots 21}a^{8}+\frac{75\cdots 27}{21\cdots 21}a^{7}+\frac{12\cdots 91}{21\cdots 21}a^{6}+\frac{89\cdots 26}{21\cdots 21}a^{5}-\frac{96\cdots 82}{21\cdots 21}a^{4}-\frac{37\cdots 92}{70\cdots 07}a^{3}-\frac{93\cdots 44}{23\cdots 69}a^{2}+\frac{25\cdots 94}{21\cdots 21}a+\frac{37\cdots 07}{70\cdots 07}$, $\frac{69\cdots 85}{23\cdots 69}a^{19}-\frac{95\cdots 71}{70\cdots 07}a^{18}+\frac{37\cdots 85}{70\cdots 07}a^{17}-\frac{23\cdots 81}{70\cdots 07}a^{16}+\frac{20\cdots 26}{77\cdots 23}a^{15}+\frac{13\cdots 68}{23\cdots 69}a^{14}+\frac{33\cdots 47}{70\cdots 07}a^{13}+\frac{11\cdots 92}{70\cdots 07}a^{12}+\frac{14\cdots 18}{23\cdots 69}a^{11}+\frac{52\cdots 54}{23\cdots 69}a^{10}+\frac{28\cdots 08}{31\cdots 53}a^{9}+\frac{14\cdots 80}{70\cdots 07}a^{8}+\frac{59\cdots 73}{70\cdots 07}a^{7}+\frac{14\cdots 67}{70\cdots 07}a^{6}+\frac{24\cdots 31}{70\cdots 07}a^{5}+\frac{62\cdots 16}{23\cdots 69}a^{4}-\frac{17\cdots 00}{70\cdots 07}a^{3}-\frac{10\cdots 56}{70\cdots 07}a^{2}+\frac{17\cdots 11}{70\cdots 07}a+\frac{18\cdots 51}{23\cdots 69}$, $\frac{10\cdots 78}{21\cdots 21}a^{19}-\frac{92\cdots 04}{70\cdots 07}a^{18}+\frac{19\cdots 22}{23\cdots 69}a^{17}+\frac{24\cdots 71}{21\cdots 21}a^{16}+\frac{28\cdots 90}{70\cdots 07}a^{15}+\frac{35\cdots 77}{21\cdots 21}a^{14}+\frac{20\cdots 20}{21\cdots 21}a^{13}+\frac{78\cdots 79}{21\cdots 21}a^{12}+\frac{10\cdots 62}{70\cdots 07}a^{11}+\frac{10\cdots 95}{23\cdots 69}a^{10}+\frac{43\cdots 21}{21\cdots 21}a^{9}+\frac{10\cdots 87}{21\cdots 21}a^{8}+\frac{35\cdots 69}{21\cdots 21}a^{7}+\frac{10\cdots 95}{21\cdots 21}a^{6}+\frac{22\cdots 11}{21\cdots 21}a^{5}+\frac{64\cdots 86}{21\cdots 21}a^{4}+\frac{15\cdots 40}{70\cdots 07}a^{3}-\frac{19\cdots 15}{70\cdots 07}a^{2}+\frac{64\cdots 46}{21\cdots 21}a-\frac{34\cdots 46}{70\cdots 07}$ 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:  \( 8009866748.83 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 8009866748.83 \cdot 6407424}{2\cdot\sqrt{4141864704128763454804479176602577540516903124992}}\cr\approx \mathstrut & 1.20914807451 \end{aligned}\] (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 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329) 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 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329, 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 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329); 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 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329); 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

\(\Q(\sqrt{901}) \), \(\Q(\sqrt{-102 +2 \sqrt{901}})\), 5.5.2382032.1, 10.10.426987989728139087104.1

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 sibling: data not computed
Degree 40 siblings: data not computed
Minimal sibling: 20.0.78148390643938933109518475030237312085224587264.1

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R ${\href{/padicField/3.4.0.1}{4} }^{4}{,}\,{\href{/padicField/3.2.0.1}{2} }{,}\,{\href{/padicField/3.1.0.1}{1} }^{2}$ ${\href{/padicField/5.4.0.1}{4} }^{4}{,}\,{\href{/padicField/5.2.0.1}{2} }{,}\,{\href{/padicField/5.1.0.1}{1} }^{2}$ $20$ $20$ ${\href{/padicField/13.10.0.1}{10} }^{2}$ R ${\href{/padicField/19.4.0.1}{4} }^{4}{,}\,{\href{/padicField/19.2.0.1}{2} }^{2}$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }{,}\,{\href{/padicField/23.1.0.1}{1} }^{2}$ ${\href{/padicField/29.4.0.1}{4} }^{5}$ ${\href{/padicField/31.4.0.1}{4} }^{4}{,}\,{\href{/padicField/31.2.0.1}{2} }{,}\,{\href{/padicField/31.1.0.1}{1} }^{2}$ ${\href{/padicField/37.4.0.1}{4} }^{5}$ ${\href{/padicField/41.4.0.1}{4} }^{4}{,}\,{\href{/padicField/41.2.0.1}{2} }{,}\,{\href{/padicField/41.1.0.1}{1} }^{2}$ ${\href{/padicField/43.5.0.1}{5} }^{4}$ ${\href{/padicField/47.2.0.1}{2} }^{10}$ R ${\href{/padicField/59.10.0.1}{10} }^{2}$

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 2.2.2.4a1.1$x^{4} + 2 x^{3} + 5 x^{2} + 4 x + 5$$2$$2$$4$$C_2^2$$$[2]^{2}$$
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$$$[2]^{4}$$
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$$$[2]^{4}$$
\(17\) Copy content Toggle raw display 17.1.4.3a1.3$x^{4} + 153$$4$$1$$3$$C_4$$$[\ ]_{4}$$
17.2.4.6a1.2$x^{8} + 64 x^{7} + 1548 x^{6} + 16960 x^{5} + 74806 x^{4} + 50880 x^{3} + 13932 x^{2} + 1728 x + 98$$4$$2$$6$$C_4\times C_2$$$[\ ]_{4}^{2}$$
17.2.4.6a1.2$x^{8} + 64 x^{7} + 1548 x^{6} + 16960 x^{5} + 74806 x^{4} + 50880 x^{3} + 13932 x^{2} + 1728 x + 98$$4$$2$$6$$C_4\times C_2$$$[\ ]_{4}^{2}$$
\(53\) Copy content Toggle raw display 53.1.2.1a1.1$x^{2} + 53$$2$$1$$1$$C_2$$$[\ ]_{2}$$
53.1.2.1a1.1$x^{2} + 53$$2$$1$$1$$C_2$$$[\ ]_{2}$$
53.1.4.3a1.1$x^{4} + 53$$4$$1$$3$$C_4$$$[\ ]_{4}$$
53.1.4.3a1.1$x^{4} + 53$$4$$1$$3$$C_4$$$[\ ]_{4}$$
53.1.4.3a1.1$x^{4} + 53$$4$$1$$3$$C_4$$$[\ ]_{4}$$
53.1.4.3a1.1$x^{4} + 53$$4$$1$$3$$C_4$$$[\ ]_{4}$$

Spectrum of ring of integers

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