Properties

Label 20.0.868...000.3
Degree $20$
Signature $(0, 10)$
Discriminant $8.683\times 10^{37}$
Root discriminant \(78.87\)
Ramified primes $2,3,5,11$
Class number $318100$ (GRH)
Class group [10, 31810] (GRH)
Galois group $C_{20}$ (as 20T1)

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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 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201)
 
Copy content gp:K = bnfinit(y^20 - 4*y^19 + 65*y^18 - 214*y^17 + 2035*y^16 - 5724*y^15 + 39824*y^14 - 96080*y^13 + 534824*y^12 - 1102236*y^11 + 5168310*y^10 - 9006872*y^9 + 36960084*y^8 - 53466672*y^7 + 196375269*y^6 - 224863132*y^5 + 733497061*y^4 - 597365054*y^3 + 1764047967*y^2 - 786154512*y + 2065660201, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 4*x^19 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 4*x^19 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201)
 

\( x^{20} - 4 x^{19} + 65 x^{18} - 214 x^{17} + 2035 x^{16} - 5724 x^{15} + 39824 x^{14} + \cdots + 2065660201 \) 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:   \(86825139158850321116448000000000000000\) \(\medspace = 2^{20}\cdot 3^{10}\cdot 5^{15}\cdot 11^{16}\) 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:  \(78.87\)
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:  $2\cdot 3^{1/2}5^{3/4}11^{4/5}\approx 78.87371092461403$
Ramified primes:   \(2\), \(3\), \(5\), \(11\) 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:  \(\Q(\sqrt{5}) \)
$\Aut(K/\Q)$ $=$ $\Gal(K/\Q)$:   $C_{20}$
Copy content comment:Automorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphism_group(K)
 
This field is Galois and abelian over $\Q$.
Conductor:  \(660=2^{2}\cdot 3\cdot 5\cdot 11\)
Dirichlet character group:    $\lbrace$$\chi_{660}(1,·)$, $\chi_{660}(323,·)$, $\chi_{660}(647,·)$, $\chi_{660}(587,·)$, $\chi_{660}(529,·)$, $\chi_{660}(467,·)$, $\chi_{660}(203,·)$, $\chi_{660}(23,·)$, $\chi_{660}(229,·)$, $\chi_{660}(289,·)$, $\chi_{660}(421,·)$, $\chi_{660}(169,·)$, $\chi_{660}(301,·)$, $\chi_{660}(47,·)$, $\chi_{660}(287,·)$, $\chi_{660}(49,·)$, $\chi_{660}(181,·)$, $\chi_{660}(361,·)$, $\chi_{660}(443,·)$, $\chi_{660}(383,·)$$\rbrace$
This is a CM field.
Reflex fields:  unavailable$^{512}$

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{3}a^{10}+\frac{1}{3}a^{9}-\frac{1}{3}a^{8}-\frac{1}{3}a^{7}+\frac{1}{3}a^{6}+\frac{1}{3}a^{5}-\frac{1}{3}a^{4}-\frac{1}{3}a^{3}+\frac{1}{3}$, $\frac{1}{3}a^{11}+\frac{1}{3}a^{9}-\frac{1}{3}a^{7}+\frac{1}{3}a^{5}+\frac{1}{3}a^{3}+\frac{1}{3}a-\frac{1}{3}$, $\frac{1}{3}a^{12}-\frac{1}{3}a^{9}+\frac{1}{3}a^{7}-\frac{1}{3}a^{5}-\frac{1}{3}a^{4}+\frac{1}{3}a^{3}+\frac{1}{3}a^{2}-\frac{1}{3}a-\frac{1}{3}$, $\frac{1}{3}a^{13}+\frac{1}{3}a^{9}-\frac{1}{3}a^{7}-\frac{1}{3}a^{2}-\frac{1}{3}a+\frac{1}{3}$, $\frac{1}{3}a^{14}-\frac{1}{3}a^{9}+\frac{1}{3}a^{7}-\frac{1}{3}a^{6}-\frac{1}{3}a^{5}+\frac{1}{3}a^{4}-\frac{1}{3}a^{2}+\frac{1}{3}a-\frac{1}{3}$, $\frac{1}{3}a^{15}+\frac{1}{3}a^{9}+\frac{1}{3}a^{7}-\frac{1}{3}a^{5}-\frac{1}{3}a^{4}+\frac{1}{3}a^{3}+\frac{1}{3}a^{2}-\frac{1}{3}a+\frac{1}{3}$, $\frac{1}{3}a^{16}-\frac{1}{3}a^{9}-\frac{1}{3}a^{8}+\frac{1}{3}a^{7}+\frac{1}{3}a^{6}+\frac{1}{3}a^{5}-\frac{1}{3}a^{4}-\frac{1}{3}a^{3}-\frac{1}{3}a^{2}+\frac{1}{3}a-\frac{1}{3}$, $\frac{1}{3}a^{17}-\frac{1}{3}a^{6}+\frac{1}{3}a^{4}+\frac{1}{3}a^{3}+\frac{1}{3}a^{2}-\frac{1}{3}a+\frac{1}{3}$, $\frac{1}{27\cdots 83}a^{18}-\frac{18\cdots 84}{27\cdots 83}a^{17}+\frac{49\cdots 02}{91\cdots 61}a^{16}+\frac{22\cdots 77}{27\cdots 83}a^{15}+\frac{12\cdots 99}{91\cdots 61}a^{14}+\frac{27\cdots 64}{27\cdots 83}a^{13}+\frac{14\cdots 93}{27\cdots 83}a^{12}+\frac{76\cdots 51}{27\cdots 83}a^{11}+\frac{33\cdots 65}{27\cdots 83}a^{10}-\frac{17\cdots 28}{91\cdots 61}a^{9}-\frac{73\cdots 73}{27\cdots 83}a^{8}+\frac{36\cdots 21}{91\cdots 61}a^{7}-\frac{10\cdots 60}{27\cdots 83}a^{6}-\frac{11\cdots 23}{27\cdots 83}a^{5}-\frac{84\cdots 87}{27\cdots 83}a^{4}-\frac{11\cdots 17}{27\cdots 83}a^{3}-\frac{10\cdots 35}{27\cdots 83}a^{2}+\frac{93\cdots 15}{27\cdots 83}a-\frac{11\cdots 37}{27\cdots 83}$, $\frac{1}{23\cdots 43}a^{19}-\frac{11\cdots 75}{77\cdots 81}a^{18}+\frac{30\cdots 87}{23\cdots 43}a^{17}+\frac{23\cdots 95}{23\cdots 43}a^{16}+\frac{14\cdots 86}{23\cdots 43}a^{15}+\frac{73\cdots 55}{23\cdots 43}a^{14}-\frac{32\cdots 00}{77\cdots 81}a^{13}+\frac{17\cdots 27}{23\cdots 43}a^{12}-\frac{10\cdots 54}{77\cdots 81}a^{11}+\frac{49\cdots 87}{23\cdots 43}a^{10}-\frac{59\cdots 37}{77\cdots 81}a^{9}+\frac{24\cdots 61}{23\cdots 43}a^{8}-\frac{63\cdots 91}{23\cdots 43}a^{7}+\frac{24\cdots 33}{23\cdots 43}a^{6}-\frac{34\cdots 28}{77\cdots 81}a^{5}-\frac{28\cdots 07}{77\cdots 81}a^{4}+\frac{12\cdots 70}{77\cdots 81}a^{3}-\frac{19\cdots 27}{23\cdots 43}a^{2}-\frac{88\cdots 22}{23\cdots 43}a+\frac{27\cdots 56}{23\cdots 43}$ 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:  $C_{10}\times C_{31810}$, which has order $318100$ (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:  $C_{10}\times C_{31810}$, which has order $318100$ (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:   $318100$ (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:   $\frac{13568180049644}{27\cdots 83}a^{19}+\frac{134897714527690}{27\cdots 83}a^{18}+\frac{104276651336804}{27\cdots 83}a^{17}+\frac{71\cdots 20}{27\cdots 83}a^{16}-\frac{21\cdots 12}{91\cdots 61}a^{15}+\frac{18\cdots 86}{27\cdots 83}a^{14}-\frac{24\cdots 80}{27\cdots 83}a^{13}+\frac{30\cdots 61}{27\cdots 83}a^{12}-\frac{39\cdots 92}{27\cdots 83}a^{11}+\frac{34\cdots 51}{27\cdots 83}a^{10}-\frac{40\cdots 08}{27\cdots 83}a^{9}+\frac{90\cdots 97}{91\cdots 61}a^{8}-\frac{27\cdots 28}{27\cdots 83}a^{7}+\frac{53\cdots 27}{91\cdots 61}a^{6}-\frac{44\cdots 16}{91\cdots 61}a^{5}+\frac{66\cdots 29}{27\cdots 83}a^{4}-\frac{38\cdots 96}{27\cdots 83}a^{3}+\frac{17\cdots 74}{27\cdots 83}a^{2}-\frac{18\cdots 94}{91\cdots 61}a+\frac{40\cdots 64}{27\cdots 83}$, $\frac{11\cdots 56}{77\cdots 81}a^{19}-\frac{71\cdots 10}{77\cdots 81}a^{18}+\frac{32\cdots 76}{77\cdots 81}a^{17}+\frac{68\cdots 10}{77\cdots 81}a^{16}+\frac{10\cdots 32}{77\cdots 81}a^{15}+\frac{38\cdots 24}{77\cdots 81}a^{14}-\frac{13\cdots 20}{77\cdots 81}a^{13}+\frac{98\cdots 69}{77\cdots 81}a^{12}-\frac{37\cdots 16}{77\cdots 81}a^{11}+\frac{14\cdots 23}{77\cdots 81}a^{10}-\frac{52\cdots 52}{77\cdots 81}a^{9}+\frac{14\cdots 64}{77\cdots 81}a^{8}-\frac{45\cdots 92}{77\cdots 81}a^{7}+\frac{10\cdots 39}{77\cdots 81}a^{6}-\frac{27\cdots 04}{77\cdots 81}a^{5}+\frac{49\cdots 61}{77\cdots 81}a^{4}-\frac{10\cdots 64}{77\cdots 81}a^{3}+\frac{15\cdots 22}{77\cdots 81}a^{2}-\frac{20\cdots 82}{77\cdots 81}a+\frac{22\cdots 80}{77\cdots 81}$, $\frac{49\cdots 20}{77\cdots 81}a^{19}+\frac{13\cdots 90}{77\cdots 81}a^{18}-\frac{35\cdots 50}{77\cdots 81}a^{17}+\frac{87\cdots 50}{77\cdots 81}a^{16}-\frac{24\cdots 00}{77\cdots 81}a^{15}+\frac{27\cdots 90}{77\cdots 81}a^{14}-\frac{69\cdots 60}{77\cdots 81}a^{13}+\frac{52\cdots 05}{77\cdots 81}a^{12}-\frac{11\cdots 40}{77\cdots 81}a^{11}+\frac{66\cdots 59}{77\cdots 81}a^{10}-\frac{12\cdots 30}{77\cdots 81}a^{9}+\frac{60\cdots 40}{77\cdots 81}a^{8}-\frac{97\cdots 40}{77\cdots 81}a^{7}+\frac{39\cdots 35}{77\cdots 81}a^{6}-\frac{51\cdots 74}{77\cdots 81}a^{5}+\frac{18\cdots 80}{77\cdots 81}a^{4}-\frac{18\cdots 90}{77\cdots 81}a^{3}+\frac{54\cdots 85}{77\cdots 81}a^{2}-\frac{31\cdots 40}{77\cdots 81}a+\frac{73\cdots 31}{77\cdots 81}$, $\frac{63\cdots 36}{77\cdots 81}a^{19}-\frac{13\cdots 00}{77\cdots 81}a^{18}+\frac{68\cdots 26}{77\cdots 81}a^{17}-\frac{80\cdots 40}{77\cdots 81}a^{16}+\frac{25\cdots 32}{77\cdots 81}a^{15}-\frac{23\cdots 66}{77\cdots 81}a^{14}+\frac{55\cdots 40}{77\cdots 81}a^{13}-\frac{42\cdots 36}{77\cdots 81}a^{12}+\frac{78\cdots 24}{77\cdots 81}a^{11}-\frac{52\cdots 36}{77\cdots 81}a^{10}+\frac{75\cdots 78}{77\cdots 81}a^{9}-\frac{45\cdots 76}{77\cdots 81}a^{8}+\frac{51\cdots 48}{77\cdots 81}a^{7}-\frac{29\cdots 96}{77\cdots 81}a^{6}+\frac{24\cdots 70}{77\cdots 81}a^{5}-\frac{13\cdots 19}{77\cdots 81}a^{4}+\frac{75\cdots 26}{77\cdots 81}a^{3}-\frac{39\cdots 63}{77\cdots 81}a^{2}+\frac{11\cdots 58}{77\cdots 81}a-\frac{58\cdots 32}{77\cdots 81}$, $\frac{23\cdots 60}{77\cdots 81}a^{19}+\frac{14\cdots 30}{77\cdots 81}a^{18}-\frac{42\cdots 20}{77\cdots 81}a^{17}+\frac{92\cdots 15}{77\cdots 81}a^{16}-\frac{25\cdots 20}{77\cdots 81}a^{15}+\frac{28\cdots 80}{77\cdots 81}a^{14}-\frac{67\cdots 00}{77\cdots 81}a^{13}+\frac{52\cdots 45}{77\cdots 81}a^{12}-\frac{10\cdots 80}{77\cdots 81}a^{11}+\frac{66\cdots 05}{77\cdots 81}a^{10}-\frac{11\cdots 00}{77\cdots 81}a^{9}+\frac{59\cdots 05}{77\cdots 81}a^{8}-\frac{87\cdots 40}{77\cdots 81}a^{7}+\frac{38\cdots 05}{77\cdots 81}a^{6}-\frac{44\cdots 24}{77\cdots 81}a^{5}+\frac{17\cdots 05}{77\cdots 81}a^{4}-\frac{15\cdots 00}{77\cdots 81}a^{3}+\frac{53\cdots 60}{77\cdots 81}a^{2}-\frac{24\cdots 70}{77\cdots 81}a+\frac{71\cdots 14}{77\cdots 81}$, $\frac{18\cdots 04}{23\cdots 43}a^{19}+\frac{55\cdots 80}{23\cdots 43}a^{18}-\frac{11\cdots 76}{23\cdots 43}a^{17}+\frac{33\cdots 65}{23\cdots 43}a^{16}-\frac{26\cdots 72}{77\cdots 81}a^{15}+\frac{99\cdots 46}{23\cdots 43}a^{14}-\frac{22\cdots 80}{23\cdots 43}a^{13}+\frac{18\cdots 16}{23\cdots 43}a^{12}-\frac{36\cdots 72}{23\cdots 43}a^{11}+\frac{22\cdots 86}{23\cdots 43}a^{10}-\frac{38\cdots 68}{23\cdots 43}a^{9}+\frac{67\cdots 42}{77\cdots 81}a^{8}-\frac{28\cdots 08}{23\cdots 43}a^{7}+\frac{43\cdots 72}{77\cdots 81}a^{6}-\frac{48\cdots 60}{77\cdots 81}a^{5}+\frac{59\cdots 24}{23\cdots 43}a^{4}-\frac{48\cdots 16}{23\cdots 43}a^{3}+\frac{17\cdots 34}{23\cdots 43}a^{2}-\frac{26\cdots 44}{77\cdots 81}a+\frac{27\cdots 29}{23\cdots 43}$, $\frac{22\cdots 44}{23\cdots 43}a^{19}-\frac{13\cdots 20}{23\cdots 43}a^{18}+\frac{89\cdots 44}{23\cdots 43}a^{17}-\frac{40\cdots 90}{23\cdots 43}a^{16}+\frac{28\cdots 84}{77\cdots 81}a^{15}-\frac{42\cdots 34}{23\cdots 43}a^{14}-\frac{21\cdots 80}{23\cdots 43}a^{13}+\frac{35\cdots 26}{23\cdots 43}a^{12}-\frac{80\cdots 16}{23\cdots 43}a^{11}+\frac{15\cdots 98}{23\cdots 43}a^{10}-\frac{12\cdots 88}{23\cdots 43}a^{9}+\frac{69\cdots 27}{77\cdots 81}a^{8}-\frac{11\cdots 88}{23\cdots 43}a^{7}+\frac{55\cdots 72}{77\cdots 81}a^{6}-\frac{23\cdots 68}{77\cdots 81}a^{5}+\frac{91\cdots 74}{23\cdots 43}a^{4}-\frac{29\cdots 76}{23\cdots 43}a^{3}+\frac{30\cdots 12}{23\cdots 43}a^{2}-\frac{18\cdots 08}{77\cdots 81}a+\frac{34\cdots 96}{23\cdots 43}$, $\frac{38\cdots 44}{23\cdots 43}a^{19}+\frac{16\cdots 10}{23\cdots 43}a^{18}-\frac{13\cdots 26}{23\cdots 43}a^{17}+\frac{75\cdots 15}{23\cdots 43}a^{16}-\frac{21\cdots 72}{77\cdots 81}a^{15}+\frac{18\cdots 76}{23\cdots 43}a^{14}-\frac{12\cdots 00}{23\cdots 43}a^{13}+\frac{27\cdots 01}{23\cdots 43}a^{12}-\frac{10\cdots 52}{23\cdots 43}a^{11}+\frac{28\cdots 09}{23\cdots 43}a^{10}-\frac{10\cdots 78}{23\cdots 43}a^{9}+\frac{69\cdots 02}{77\cdots 81}a^{8}+\frac{77\cdots 12}{23\cdots 43}a^{7}+\frac{38\cdots 37}{77\cdots 81}a^{6}+\frac{33\cdots 14}{77\cdots 81}a^{5}+\frac{44\cdots 84}{23\cdots 43}a^{4}+\frac{72\cdots 54}{23\cdots 43}a^{3}+\frac{11\cdots 79}{23\cdots 43}a^{2}+\frac{56\cdots 96}{77\cdots 81}a+\frac{50\cdots 36}{23\cdots 43}$, $\frac{11\cdots 94}{23\cdots 43}a^{19}+\frac{34\cdots 77}{23\cdots 43}a^{18}-\frac{51\cdots 96}{23\cdots 43}a^{17}+\frac{21\cdots 67}{23\cdots 43}a^{16}-\frac{40\cdots 12}{23\cdots 43}a^{15}+\frac{21\cdots 32}{77\cdots 81}a^{14}-\frac{11\cdots 42}{23\cdots 43}a^{13}+\frac{11\cdots 53}{23\cdots 43}a^{12}-\frac{18\cdots 76}{23\cdots 43}a^{11}+\frac{15\cdots 22}{23\cdots 43}a^{10}-\frac{65\cdots 70}{77\cdots 81}a^{9}+\frac{13\cdots 37}{23\cdots 43}a^{8}-\frac{47\cdots 80}{77\cdots 81}a^{7}+\frac{29\cdots 54}{77\cdots 81}a^{6}-\frac{25\cdots 20}{77\cdots 81}a^{5}+\frac{41\cdots 36}{23\cdots 43}a^{4}-\frac{87\cdots 64}{77\cdots 81}a^{3}+\frac{12\cdots 41}{23\cdots 43}a^{2}-\frac{43\cdots 34}{23\cdots 43}a+\frac{61\cdots 39}{77\cdots 81}$ 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:  \( 140644.599182 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 140644.599182 \cdot 318100}{2\cdot\sqrt{86825139158850321116448000000000000000}}\cr\approx \mathstrut & 0.230214499275 \end{aligned}\] (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 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201) 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 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201, 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 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201); 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 + 65*x^18 - 214*x^17 + 2035*x^16 - 5724*x^15 + 39824*x^14 - 96080*x^13 + 534824*x^12 - 1102236*x^11 + 5168310*x^10 - 9006872*x^9 + 36960084*x^8 - 53466672*x^7 + 196375269*x^6 - 224863132*x^5 + 733497061*x^4 - 597365054*x^3 + 1764047967*x^2 - 786154512*x + 2065660201); 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

$C_{20}$ (as 20T1):

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 cyclic group of order 20
The 20 conjugacy class representatives for $C_{20}$
Character table for $C_{20}$

Intermediate fields

\(\Q(\sqrt{5}) \), \(\Q(\sqrt{-30 +6 \sqrt{5}})\), \(\Q(\zeta_{11})^+\), 10.10.669871503125.1

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]
 

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R R R $20$ R $20$ $20$ ${\href{/padicField/19.5.0.1}{5} }^{4}$ ${\href{/padicField/23.4.0.1}{4} }^{5}$ ${\href{/padicField/29.5.0.1}{5} }^{4}$ ${\href{/padicField/31.10.0.1}{10} }^{2}$ $20$ ${\href{/padicField/41.10.0.1}{10} }^{2}$ ${\href{/padicField/43.4.0.1}{4} }^{5}$ $20$ $20$ ${\href{/padicField/59.10.0.1}{10} }^{2}$

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 2.10.2.20a1.2$x^{20} + 2 x^{16} + 2 x^{15} + 2 x^{13} + 3 x^{12} + 4 x^{11} + 5 x^{10} + 2 x^{9} + 4 x^{8} + 4 x^{7} + 7 x^{6} + 10 x^{5} + 3 x^{4} + 6 x^{3} + 5 x^{2} + 4 x + 5$$2$$10$$20$20T1not computed
\(3\) Copy content Toggle raw display 3.10.2.10a1.1$x^{20} + 4 x^{16} + 4 x^{15} + 4 x^{14} + 4 x^{12} + 10 x^{11} + 16 x^{10} + 8 x^{9} + 4 x^{8} + 4 x^{7} + 12 x^{6} + 12 x^{5} + 8 x^{4} + x^{2} + 7 x + 4$$2$$10$$10$20T1$$[\ ]_{2}^{10}$$
\(5\) Copy content Toggle raw display 5.5.4.15a1.2$x^{20} + 16 x^{16} + 12 x^{15} + 96 x^{12} + 144 x^{11} + 54 x^{10} + 256 x^{8} + 576 x^{7} + 432 x^{6} + 108 x^{5} + 256 x^{4} + 768 x^{3} + 869 x^{2} + 432 x + 81$$4$$5$$15$20T1not computed
\(11\) Copy content Toggle raw display 11.1.5.4a1.1$x^{5} + 11$$5$$1$$4$$C_5$$$[\ ]_{5}$$
11.1.5.4a1.1$x^{5} + 11$$5$$1$$4$$C_5$$$[\ ]_{5}$$
11.1.5.4a1.1$x^{5} + 11$$5$$1$$4$$C_5$$$[\ ]_{5}$$
11.1.5.4a1.1$x^{5} + 11$$5$$1$$4$$C_5$$$[\ ]_{5}$$

Spectrum of ring of integers

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