Properties

Label 20.0.212...000.2
Degree $20$
Signature $(0, 10)$
Discriminant $2.129\times 10^{39}$
Root discriminant \(92.56\)
Ramified primes $2,3,5,7$
Class number $16400$ (GRH)
Class group [2, 2, 10, 410] (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 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824)
 
Copy content gp:K = bnfinit(y^20 - 5*y^19 - 15*y^18 + 90*y^17 + 275*y^16 - 1533*y^15 + 635*y^14 + 3760*y^13 + 2655*y^12 - 43135*y^11 + 214505*y^10 - 540540*y^9 + 1645640*y^8 - 2620560*y^7 + 9319680*y^6 - 10183012*y^5 + 37619320*y^4 - 34850760*y^3 + 90306000*y^2 - 51284160*y + 73459824, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824)
 

\( x^{20} - 5 x^{19} - 15 x^{18} + 90 x^{17} + 275 x^{16} - 1533 x^{15} + 635 x^{14} + 3760 x^{13} + \cdots + 73459824 \) 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:   \(2128822455717240071906250000000000000000\) \(\medspace = 2^{16}\cdot 3^{15}\cdot 5^{21}\cdot 7^{15}\) 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:  \(92.56\)
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:   \(2\), \(3\), \(5\), \(7\) 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:  \(\Q(\sqrt{105}) \)
$\Aut(K/\Q)$:   $C_2$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $\frac{1}{2}a^{9}-\frac{1}{2}a^{8}-\frac{1}{2}a^{6}-\frac{1}{2}a^{4}-\frac{1}{2}a^{3}$, $\frac{1}{10}a^{10}-\frac{1}{2}a^{8}-\frac{1}{2}a^{7}-\frac{1}{2}a^{6}-\frac{1}{2}a^{5}-\frac{1}{2}a^{3}+\frac{2}{5}$, $\frac{1}{10}a^{11}-\frac{1}{2}a^{7}-\frac{1}{2}a^{3}+\frac{2}{5}a$, $\frac{1}{10}a^{12}-\frac{1}{2}a^{8}-\frac{1}{2}a^{4}+\frac{2}{5}a^{2}$, $\frac{1}{10}a^{13}-\frac{1}{2}a^{8}-\frac{1}{2}a^{6}-\frac{1}{2}a^{5}-\frac{1}{2}a^{4}-\frac{1}{10}a^{3}$, $\frac{1}{10}a^{14}-\frac{1}{2}a^{8}-\frac{1}{2}a^{7}-\frac{1}{2}a^{5}+\frac{2}{5}a^{4}-\frac{1}{2}a^{3}$, $\frac{1}{100}a^{15}-\frac{1}{20}a^{14}-\frac{1}{20}a^{13}-\frac{1}{20}a^{11}+\frac{1}{100}a^{10}+\frac{3}{20}a^{9}-\frac{1}{2}a^{8}-\frac{7}{20}a^{7}-\frac{7}{20}a^{6}-\frac{11}{100}a^{5}+\frac{1}{5}a^{4}-\frac{1}{5}a^{3}+\frac{2}{5}a^{2}+\frac{1}{5}a-\frac{9}{25}$, $\frac{1}{100}a^{16}-\frac{1}{20}a^{13}-\frac{1}{20}a^{12}-\frac{1}{25}a^{11}-\frac{1}{4}a^{9}+\frac{3}{20}a^{8}+\frac{2}{5}a^{7}-\frac{9}{25}a^{6}+\frac{3}{20}a^{5}-\frac{1}{2}a^{4}+\frac{1}{5}a^{3}+\frac{1}{5}a^{2}+\frac{11}{25}a+\frac{2}{5}$, $\frac{1}{100}a^{17}-\frac{1}{20}a^{14}-\frac{1}{20}a^{13}-\frac{1}{25}a^{12}-\frac{1}{20}a^{10}+\frac{3}{20}a^{9}+\frac{2}{5}a^{8}-\frac{9}{25}a^{7}+\frac{3}{20}a^{6}-\frac{1}{2}a^{5}+\frac{1}{5}a^{4}+\frac{1}{5}a^{3}+\frac{11}{25}a^{2}+\frac{2}{5}a-\frac{1}{5}$, $\frac{1}{1000}a^{18}+\frac{3}{1000}a^{17}+\frac{3}{1000}a^{16}-\frac{1}{250}a^{15}+\frac{1}{200}a^{14}-\frac{49}{1000}a^{13}+\frac{13}{1000}a^{12}-\frac{21}{500}a^{11}+\frac{41}{1000}a^{10}-\frac{3}{40}a^{9}-\frac{221}{1000}a^{8}+\frac{221}{500}a^{7}+\frac{101}{500}a^{6}+\frac{1}{250}a^{5}-\frac{7}{25}a^{4}+\frac{38}{125}a^{3}+\frac{54}{125}a^{2}+\frac{34}{125}a-\frac{27}{125}$, $\frac{1}{12\cdots 00}a^{19}-\frac{22\cdots 67}{24\cdots 00}a^{18}-\frac{32\cdots 91}{12\cdots 00}a^{17}-\frac{11\cdots 09}{60\cdots 00}a^{16}-\frac{40\cdots 03}{12\cdots 00}a^{15}+\frac{51\cdots 61}{12\cdots 00}a^{14}-\frac{17\cdots 53}{48\cdots 60}a^{13}-\frac{90\cdots 79}{30\cdots 50}a^{12}-\frac{38\cdots 63}{12\cdots 00}a^{11}-\frac{19\cdots 93}{12\cdots 00}a^{10}+\frac{87\cdots 29}{12\cdots 00}a^{9}+\frac{33\cdots 36}{30\cdots 75}a^{8}+\frac{50\cdots 93}{60\cdots 00}a^{7}+\frac{13\cdots 57}{30\cdots 50}a^{6}-\frac{10\cdots 93}{30\cdots 50}a^{5}+\frac{75\cdots 93}{15\cdots 75}a^{4}+\frac{11\cdots 97}{30\cdots 75}a^{3}-\frac{62\cdots 58}{15\cdots 75}a^{2}-\frac{71\cdots 44}{15\cdots 75}a-\frac{26\cdots 79}{15\cdots 75}$ 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:  $C_{2}\times C_{2}\times C_{10}\times C_{410}$, which has order $16400$ (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:  $C_{2}\times C_{2}\times C_{10}\times C_{410}$, which has order $16400$ (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:   $\frac{20\cdots 84}{88\cdots 75}a^{19}+\frac{33\cdots 41}{35\cdots 90}a^{18}+\frac{18\cdots 41}{35\cdots 90}a^{17}-\frac{17\cdots 29}{88\cdots 75}a^{16}-\frac{17\cdots 89}{17\cdots 50}a^{15}+\frac{29\cdots 21}{88\cdots 75}a^{14}+\frac{34\cdots 71}{71\cdots 18}a^{13}-\frac{60\cdots 39}{35\cdots 90}a^{12}-\frac{58\cdots 63}{17\cdots 50}a^{11}+\frac{11\cdots 23}{88\cdots 75}a^{10}-\frac{25\cdots 81}{88\cdots 75}a^{9}+\frac{94\cdots 08}{17\cdots 95}a^{8}-\frac{75\cdots 97}{35\cdots 90}a^{7}+\frac{13\cdots 04}{88\cdots 75}a^{6}-\frac{98\cdots 18}{88\cdots 75}a^{5}+\frac{30\cdots 64}{88\cdots 75}a^{4}-\frac{13\cdots 23}{35\cdots 90}a^{3}+\frac{19\cdots 14}{17\cdots 95}a^{2}-\frac{40\cdots 31}{88\cdots 75}a-\frac{38\cdots 23}{88\cdots 75}$, $\frac{53\cdots 09}{12\cdots 00}a^{19}+\frac{65\cdots 56}{30\cdots 75}a^{18}+\frac{54\cdots 43}{60\cdots 50}a^{17}-\frac{13\cdots 92}{30\cdots 75}a^{16}-\frac{43\cdots 33}{24\cdots 80}a^{15}+\frac{49\cdots 73}{60\cdots 50}a^{14}+\frac{98\cdots 09}{12\cdots 00}a^{13}-\frac{27\cdots 17}{60\cdots 50}a^{12}-\frac{10\cdots 83}{12\cdots 00}a^{11}+\frac{44\cdots 37}{12\cdots 90}a^{10}-\frac{62\cdots 01}{12\cdots 00}a^{9}+\frac{33\cdots 49}{30\cdots 75}a^{8}-\frac{30\cdots 53}{60\cdots 50}a^{7}+\frac{24\cdots 57}{30\cdots 75}a^{6}-\frac{78\cdots 01}{24\cdots 80}a^{5}+\frac{13\cdots 61}{30\cdots 75}a^{4}-\frac{30\cdots 16}{30\cdots 75}a^{3}+\frac{33\cdots 16}{30\cdots 75}a^{2}-\frac{34\cdots 83}{30\cdots 75}a+\frac{24\cdots 03}{60\cdots 95}$, $\frac{23\cdots 27}{24\cdots 00}a^{19}+\frac{81\cdots 63}{24\cdots 00}a^{18}+\frac{56\cdots 21}{24\cdots 00}a^{17}-\frac{16\cdots 99}{24\cdots 80}a^{16}-\frac{21\cdots 63}{48\cdots 60}a^{15}+\frac{27\cdots 53}{24\cdots 00}a^{14}+\frac{62\cdots 93}{24\cdots 00}a^{13}-\frac{31\cdots 01}{60\cdots 50}a^{12}-\frac{15\cdots 67}{96\cdots 52}a^{11}+\frac{20\cdots 07}{48\cdots 60}a^{10}-\frac{24\cdots 93}{24\cdots 00}a^{9}+\frac{51\cdots 99}{30\cdots 75}a^{8}-\frac{94\cdots 93}{12\cdots 00}a^{7}+\frac{10\cdots 33}{48\cdots 76}a^{6}-\frac{11\cdots 37}{24\cdots 80}a^{5}-\frac{49\cdots 81}{30\cdots 75}a^{4}-\frac{52\cdots 86}{30\cdots 75}a^{3}-\frac{17\cdots 67}{30\cdots 75}a^{2}-\frac{12\cdots 71}{60\cdots 95}a-\frac{15\cdots 98}{60\cdots 95}$, $\frac{60\cdots 43}{35\cdots 00}a^{19}-\frac{16\cdots 17}{35\cdots 00}a^{18}-\frac{16\cdots 19}{35\cdots 00}a^{17}+\frac{31\cdots 69}{35\cdots 00}a^{16}+\frac{15\cdots 97}{17\cdots 50}a^{15}-\frac{12\cdots 98}{88\cdots 75}a^{14}-\frac{20\cdots 37}{35\cdots 00}a^{13}+\frac{21\cdots 21}{35\cdots 00}a^{12}+\frac{55\cdots 97}{17\cdots 50}a^{11}-\frac{47\cdots 34}{88\cdots 75}a^{10}+\frac{53\cdots 47}{35\cdots 00}a^{9}-\frac{63\cdots 43}{35\cdots 00}a^{8}+\frac{38\cdots 99}{35\cdots 00}a^{7}+\frac{22\cdots 61}{35\cdots 00}a^{6}+\frac{14\cdots 83}{17\cdots 50}a^{5}+\frac{86\cdots 33}{88\cdots 75}a^{4}+\frac{28\cdots 13}{88\cdots 75}a^{3}+\frac{29\cdots 96}{88\cdots 75}a^{2}+\frac{29\cdots 84}{88\cdots 75}a+\frac{66\cdots 49}{88\cdots 75}$, $\frac{13\cdots 07}{24\cdots 00}a^{19}-\frac{96\cdots 97}{60\cdots 50}a^{18}-\frac{18\cdots 41}{12\cdots 00}a^{17}+\frac{77\cdots 71}{24\cdots 00}a^{16}+\frac{70\cdots 99}{24\cdots 00}a^{15}-\frac{15\cdots 01}{30\cdots 75}a^{14}-\frac{23\cdots 69}{12\cdots 00}a^{13}+\frac{67\cdots 63}{24\cdots 00}a^{12}+\frac{25\cdots 01}{24\cdots 00}a^{11}-\frac{27\cdots 13}{12\cdots 00}a^{10}+\frac{58\cdots 79}{12\cdots 00}a^{9}-\frac{74\cdots 67}{24\cdots 00}a^{8}+\frac{17\cdots 83}{60\cdots 50}a^{7}+\frac{34\cdots 77}{12\cdots 00}a^{6}+\frac{29\cdots 93}{12\cdots 00}a^{5}+\frac{20\cdots 87}{60\cdots 50}a^{4}+\frac{25\cdots 51}{30\cdots 75}a^{3}+\frac{37\cdots 14}{30\cdots 75}a^{2}+\frac{22\cdots 78}{30\cdots 75}a+\frac{79\cdots 17}{30\cdots 75}$, $\frac{44\cdots 21}{24\cdots 00}a^{19}+\frac{22\cdots 92}{30\cdots 75}a^{18}+\frac{48\cdots 51}{12\cdots 00}a^{17}-\frac{37\cdots 71}{24\cdots 00}a^{16}-\frac{18\cdots 01}{24\cdots 00}a^{15}+\frac{16\cdots 71}{60\cdots 50}a^{14}+\frac{11\cdots 37}{30\cdots 75}a^{13}-\frac{32\cdots 43}{24\cdots 00}a^{12}-\frac{65\cdots 71}{24\cdots 00}a^{11}+\frac{12\cdots 47}{12\cdots 00}a^{10}-\frac{13\cdots 41}{60\cdots 50}a^{9}+\frac{10\cdots 79}{24\cdots 00}a^{8}-\frac{52\cdots 64}{30\cdots 75}a^{7}+\frac{17\cdots 53}{12\cdots 00}a^{6}-\frac{28\cdots 63}{30\cdots 75}a^{5}+\frac{12\cdots 82}{30\cdots 75}a^{4}-\frac{94\cdots 32}{30\cdots 75}a^{3}+\frac{37\cdots 76}{30\cdots 75}a^{2}-\frac{11\cdots 43}{30\cdots 75}a-\frac{31\cdots 03}{30\cdots 75}$, $\frac{79\cdots 89}{24\cdots 00}a^{19}-\frac{11\cdots 03}{24\cdots 00}a^{18}-\frac{24\cdots 69}{24\cdots 00}a^{17}+\frac{82\cdots 37}{12\cdots 00}a^{16}+\frac{45\cdots 69}{24\cdots 00}a^{15}-\frac{17\cdots 41}{24\cdots 00}a^{14}-\frac{35\cdots 83}{24\cdots 00}a^{13}-\frac{36\cdots 81}{60\cdots 50}a^{12}+\frac{17\cdots 69}{24\cdots 00}a^{11}-\frac{60\cdots 71}{24\cdots 00}a^{10}+\frac{43\cdots 51}{24\cdots 00}a^{9}+\frac{14\cdots 96}{30\cdots 75}a^{8}+\frac{13\cdots 17}{12\cdots 00}a^{7}+\frac{55\cdots 23}{12\cdots 00}a^{6}+\frac{45\cdots 02}{30\cdots 75}a^{5}+\frac{25\cdots 89}{60\cdots 50}a^{4}+\frac{40\cdots 87}{60\cdots 50}a^{3}+\frac{42\cdots 33}{30\cdots 75}a^{2}+\frac{19\cdots 72}{30\cdots 75}a+\frac{61\cdots 07}{30\cdots 75}$, $\frac{21\cdots 97}{12\cdots 00}a^{19}-\frac{42\cdots 29}{24\cdots 00}a^{18}-\frac{14\cdots 39}{24\cdots 00}a^{17}+\frac{87\cdots 07}{48\cdots 60}a^{16}+\frac{66\cdots 51}{60\cdots 50}a^{15}-\frac{73\cdots 31}{24\cdots 00}a^{14}-\frac{21\cdots 09}{24\cdots 00}a^{13}-\frac{45\cdots 59}{24\cdots 00}a^{12}+\frac{98\cdots 79}{24\cdots 80}a^{11}-\frac{55\cdots 51}{24\cdots 00}a^{10}+\frac{19\cdots 81}{24\cdots 00}a^{9}+\frac{39\cdots 19}{24\cdots 00}a^{8}+\frac{15\cdots 51}{60\cdots 50}a^{7}+\frac{42\cdots 03}{12\cdots 19}a^{6}+\frac{87\cdots 53}{12\cdots 00}a^{5}+\frac{86\cdots 07}{30\cdots 75}a^{4}+\frac{19\cdots 31}{60\cdots 50}a^{3}+\frac{29\cdots 28}{30\cdots 75}a^{2}+\frac{15\cdots 33}{60\cdots 95}a+\frac{48\cdots 17}{30\cdots 75}$, $\frac{64\cdots 67}{60\cdots 50}a^{19}+\frac{73\cdots 01}{24\cdots 00}a^{18}+\frac{67\cdots 79}{24\cdots 00}a^{17}-\frac{14\cdots 41}{24\cdots 00}a^{16}-\frac{64\cdots 11}{12\cdots 00}a^{15}+\frac{22\cdots 87}{24\cdots 00}a^{14}+\frac{82\cdots 01}{24\cdots 00}a^{13}-\frac{97\cdots 11}{24\cdots 00}a^{12}-\frac{11\cdots 29}{60\cdots 50}a^{11}+\frac{85\cdots 63}{24\cdots 00}a^{10}-\frac{23\cdots 57}{24\cdots 00}a^{9}+\frac{29\cdots 39}{24\cdots 00}a^{8}-\frac{42\cdots 81}{60\cdots 50}a^{7}-\frac{92\cdots 08}{30\cdots 75}a^{6}-\frac{61\cdots 39}{12\cdots 00}a^{5}-\frac{16\cdots 39}{30\cdots 75}a^{4}-\frac{59\cdots 42}{30\cdots 75}a^{3}-\frac{55\cdots 98}{30\cdots 75}a^{2}-\frac{63\cdots 58}{30\cdots 75}a-\frac{13\cdots 86}{30\cdots 75}$ 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:  \( 63728758.83290176 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 63728758.83290176 \cdot 16400}{2\cdot\sqrt{2128822455717240071906250000000000000000}}\cr\approx \mathstrut & 1.08612116045538 \end{aligned}\] (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 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824) 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 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824, 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 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824); 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 - 5*x^19 - 15*x^18 + 90*x^17 + 275*x^16 - 1533*x^15 + 635*x^14 + 3760*x^13 + 2655*x^12 - 43135*x^11 + 214505*x^10 - 540540*x^9 + 1645640*x^8 - 2620560*x^7 + 9319680*x^6 - 10183012*x^5 + 37619320*x^4 - 34850760*x^3 + 90306000*x^2 - 51284160*x + 73459824); 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

\(\Q(\sqrt{21}) \), \(\Q(\sqrt{-42 +2 \sqrt{21}})\), 5.5.2450000.1, 10.10.10210252500000000.1

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: 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 R R R $20$ ${\href{/padicField/13.4.0.1}{4} }^{4}{,}\,{\href{/padicField/13.2.0.1}{2} }^{2}$ ${\href{/padicField/17.4.0.1}{4} }^{4}{,}\,{\href{/padicField/17.2.0.1}{2} }{,}\,{\href{/padicField/17.1.0.1}{1} }^{2}$ $20$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }^{2}$ ${\href{/padicField/29.4.0.1}{4} }^{5}$ ${\href{/padicField/31.4.0.1}{4} }^{5}$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }{,}\,{\href{/padicField/37.1.0.1}{1} }^{2}$ ${\href{/padicField/41.2.0.1}{2} }^{8}{,}\,{\href{/padicField/41.1.0.1}{1} }^{4}$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }{,}\,{\href{/padicField/43.1.0.1}{1} }^{2}$ ${\href{/padicField/47.4.0.1}{4} }^{4}{,}\,{\href{/padicField/47.2.0.1}{2} }{,}\,{\href{/padicField/47.1.0.1}{1} }^{2}$ ${\href{/padicField/53.4.0.1}{4} }^{4}{,}\,{\href{/padicField/53.2.0.1}{2} }^{2}$ ${\href{/padicField/59.5.0.1}{5} }^{4}$

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
\(2\) Copy content Toggle raw display 2.10.8.1$x^{10} + 5 x^{9} + 15 x^{8} + 30 x^{7} + 45 x^{6} + 51 x^{5} + 45 x^{4} + 30 x^{3} + 15 x^{2} + 5 x + 3$$5$$2$$8$$F_5$$$[\ ]_{5}^{4}$$
2.10.8.1$x^{10} + 5 x^{9} + 15 x^{8} + 30 x^{7} + 45 x^{6} + 51 x^{5} + 45 x^{4} + 30 x^{3} + 15 x^{2} + 5 x + 3$$5$$2$$8$$F_5$$$[\ ]_{5}^{4}$$
\(3\) Copy content Toggle raw display 3.4.3.2$x^{4} + 6$$4$$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 5.5.5.1$x^{5} + 20 x + 5$$5$$1$$5$$F_5$$$[\frac{5}{4}]_{4}$$
5.5.5.1$x^{5} + 20 x + 5$$5$$1$$5$$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 7.4.3.1$x^{4} + 7$$4$$1$$3$$D_{4}$$$[\ ]_{4}^{2}$$
7.16.12.1$x^{16} + 20 x^{14} + 16 x^{13} + 162 x^{12} + 240 x^{11} + 776 x^{10} + 1344 x^{9} + 2539 x^{8} + 3696 x^{7} + 5016 x^{6} + 5312 x^{5} + 4594 x^{4} + 2928 x^{3} + 1404 x^{2} + 432 x + 88$$4$$4$$12$$C_4:C_4$$$[\ ]_{4}^{4}$$

Spectrum of ring of integers

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