Properties

Label 20.0.781...264.1
Degree $20$
Signature $(0, 10)$
Discriminant $7.815\times 10^{46}$
Root discriminant \(221.13\)
Ramified primes $2,17,53$
Class number $1601856$ (GRH)
Class group [2, 2, 2, 6, 6, 5562] (GRH)
Galois group $C_{20}:C_4$ (as 20T18)

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Show commands: Magma / Oscar / Pari/GP / SageMath

Normalized defining polynomial

Copy content comment:Define the number field
 
Copy content sage:x = polygen(QQ); K.<a> = NumberField(x^20 - 4*x^19 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174)
 
Copy content gp:K = bnfinit(y^20 - 4*y^19 + 96*y^18 + 122*y^17 + 4620*y^16 + 18596*y^15 + 184045*y^14 + 728624*y^13 + 6000753*y^12 + 13556428*y^11 + 139124895*y^10 + 136683460*y^9 + 2117576320*y^8 - 289614572*y^7 + 18977386826*y^6 - 37574492902*y^5 + 70623059201*y^4 - 324133328144*y^3 + 72454618799*y^2 - 66338130030*y + 1082598671174, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 4*x^19 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 4*x^19 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174)
 

\( x^{20} - 4 x^{19} + 96 x^{18} + 122 x^{17} + 4620 x^{16} + 18596 x^{15} + 184045 x^{14} + \cdots + 1082598671174 \) 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:   \(78148390643938933109518475030237312085224587264\) \(\medspace = 2^{20}\cdot 17^{15}\cdot 53^{13}\) 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:  \(221.13\)
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:  \(\Q(\sqrt{901}) \)
$\Aut(K/\Q)$:   $C_2$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $\frac{1}{3}a^{15}+\frac{1}{3}a^{13}-\frac{1}{3}a^{12}+\frac{1}{3}a^{11}-\frac{1}{3}a^{10}+\frac{1}{3}a^{7}-\frac{1}{3}a^{6}-\frac{1}{3}a^{5}+\frac{1}{3}a^{4}-\frac{1}{3}a+\frac{1}{3}$, $\frac{1}{51}a^{16}-\frac{2}{51}a^{15}-\frac{20}{51}a^{14}+\frac{3}{17}a^{13}-\frac{8}{17}a^{12}+\frac{6}{17}a^{11}+\frac{1}{3}a^{10}-\frac{3}{17}a^{9}-\frac{8}{51}a^{8}+\frac{2}{17}a^{7}-\frac{1}{3}a^{6}+\frac{7}{17}a^{5}+\frac{19}{51}a^{4}-\frac{6}{17}a^{3}-\frac{1}{51}a^{2}+\frac{8}{17}a+\frac{1}{51}$, $\frac{1}{51}a^{17}-\frac{7}{51}a^{15}+\frac{20}{51}a^{14}+\frac{11}{51}a^{13}+\frac{4}{51}a^{12}+\frac{19}{51}a^{11}+\frac{8}{51}a^{10}+\frac{25}{51}a^{9}-\frac{10}{51}a^{8}+\frac{4}{17}a^{7}+\frac{7}{17}a^{6}-\frac{7}{51}a^{5}-\frac{14}{51}a^{4}+\frac{14}{51}a^{3}+\frac{22}{51}a^{2}-\frac{19}{51}a+\frac{19}{51}$, $\frac{1}{153}a^{18}-\frac{1}{153}a^{16}+\frac{25}{153}a^{15}+\frac{44}{153}a^{14}-\frac{3}{17}a^{13}+\frac{11}{153}a^{12}-\frac{71}{153}a^{11}-\frac{43}{153}a^{10}+\frac{38}{153}a^{9}-\frac{4}{17}a^{8}+\frac{74}{153}a^{7}-\frac{25}{51}a^{6}+\frac{44}{153}a^{5}-\frac{8}{153}a^{4}-\frac{35}{153}a^{3}-\frac{76}{153}a^{2}-\frac{58}{153}a+\frac{74}{153}$, $\frac{1}{25\cdots 12}a^{19}+\frac{47\cdots 35}{25\cdots 12}a^{18}-\frac{24\cdots 75}{25\cdots 12}a^{17}-\frac{92\cdots 37}{83\cdots 04}a^{16}-\frac{19\cdots 65}{14\cdots 48}a^{15}-\frac{60\cdots 59}{25\cdots 12}a^{14}+\frac{14\cdots 76}{62\cdots 53}a^{13}-\frac{33\cdots 12}{69\cdots 17}a^{12}+\frac{47\cdots 15}{83\cdots 04}a^{11}+\frac{38\cdots 19}{25\cdots 12}a^{10}+\frac{26\cdots 74}{62\cdots 53}a^{9}-\frac{98\cdots 75}{62\cdots 53}a^{8}-\frac{30\cdots 72}{62\cdots 53}a^{7}+\frac{18\cdots 20}{62\cdots 53}a^{6}-\frac{89\cdots 59}{46\cdots 78}a^{5}+\frac{25\cdots 58}{62\cdots 53}a^{4}+\frac{29\cdots 11}{83\cdots 04}a^{3}-\frac{72\cdots 13}{25\cdots 12}a^{2}+\frac{17\cdots 56}{62\cdots 53}a-\frac{32\cdots 81}{12\cdots 06}$ 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:  $C_{2}\times C_{2}\times C_{2}\times C_{6}\times C_{6}\times C_{5562}$, which has order $1601856$ (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:  $C_{2}\times C_{2}\times C_{2}\times C_{6}\times C_{6}\times C_{5562}$, which has order $1601856$ (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:   $\frac{51\cdots 65}{99\cdots 11}a^{19}+\frac{30\cdots 24}{99\cdots 11}a^{18}+\frac{17\cdots 50}{33\cdots 37}a^{17}+\frac{42\cdots 17}{99\cdots 11}a^{16}+\frac{50\cdots 87}{99\cdots 11}a^{15}+\frac{34\cdots 94}{99\cdots 11}a^{14}+\frac{88\cdots 73}{33\cdots 37}a^{13}+\frac{15\cdots 51}{99\cdots 11}a^{12}+\frac{94\cdots 33}{99\cdots 11}a^{11}+\frac{44\cdots 17}{99\cdots 11}a^{10}+\frac{21\cdots 38}{99\cdots 11}a^{9}+\frac{26\cdots 49}{33\cdots 37}a^{8}+\frac{11\cdots 08}{33\cdots 37}a^{7}+\frac{85\cdots 39}{99\cdots 11}a^{6}+\frac{28\cdots 40}{99\cdots 11}a^{5}+\frac{82\cdots 76}{99\cdots 11}a^{4}-\frac{46\cdots 34}{33\cdots 37}a^{3}-\frac{73\cdots 79}{99\cdots 11}a^{2}-\frac{38\cdots 10}{33\cdots 37}a-\frac{57\cdots 55}{33\cdots 37}$, $\frac{38\cdots 49}{29\cdots 33}a^{19}-\frac{19\cdots 56}{29\cdots 33}a^{18}+\frac{42\cdots 98}{29\cdots 33}a^{17}-\frac{14\cdots 76}{29\cdots 33}a^{16}+\frac{20\cdots 35}{29\cdots 33}a^{15}+\frac{57\cdots 87}{29\cdots 33}a^{14}+\frac{74\cdots 25}{29\cdots 33}a^{13}+\frac{26\cdots 10}{29\cdots 33}a^{12}+\frac{23\cdots 92}{29\cdots 33}a^{11}+\frac{14\cdots 61}{99\cdots 11}a^{10}+\frac{61\cdots 32}{29\cdots 33}a^{9}+\frac{81\cdots 78}{29\cdots 33}a^{8}+\frac{10\cdots 00}{29\cdots 33}a^{7}-\frac{81\cdots 85}{29\cdots 33}a^{6}+\frac{91\cdots 60}{29\cdots 33}a^{5}-\frac{54\cdots 01}{99\cdots 11}a^{4}+\frac{20\cdots 75}{29\cdots 33}a^{3}-\frac{35\cdots 38}{99\cdots 11}a^{2}-\frac{35\cdots 38}{99\cdots 11}a+\frac{84\cdots 81}{29\cdots 33}$, $\frac{16\cdots 40}{32\cdots 83}a^{19}-\frac{94\cdots 72}{32\cdots 83}a^{18}+\frac{14\cdots 44}{32\cdots 83}a^{17}+\frac{18\cdots 24}{10\cdots 61}a^{16}+\frac{27\cdots 02}{16\cdots 63}a^{15}+\frac{10\cdots 12}{19\cdots 99}a^{14}+\frac{18\cdots 70}{32\cdots 83}a^{13}+\frac{15\cdots 02}{10\cdots 61}a^{12}+\frac{20\cdots 63}{12\cdots 29}a^{11}-\frac{81\cdots 56}{32\cdots 83}a^{10}+\frac{11\cdots 72}{32\cdots 83}a^{9}-\frac{16\cdots 45}{32\cdots 83}a^{8}+\frac{87\cdots 68}{19\cdots 99}a^{7}-\frac{44\cdots 06}{32\cdots 83}a^{6}+\frac{37\cdots 16}{10\cdots 61}a^{5}-\frac{60\cdots 57}{32\cdots 83}a^{4}+\frac{20\cdots 75}{10\cdots 61}a^{3}+\frac{35\cdots 20}{32\cdots 83}a^{2}+\frac{23\cdots 94}{32\cdots 83}a-\frac{11\cdots 89}{32\cdots 83}$, $\frac{23\cdots 42}{32\cdots 83}a^{19}-\frac{28\cdots 33}{32\cdots 83}a^{18}+\frac{34\cdots 08}{32\cdots 83}a^{17}-\frac{33\cdots 35}{64\cdots 33}a^{16}+\frac{21\cdots 26}{56\cdots 21}a^{15}-\frac{35\cdots 19}{32\cdots 83}a^{14}+\frac{21\cdots 40}{32\cdots 83}a^{13}-\frac{78\cdots 96}{36\cdots 87}a^{12}+\frac{18\cdots 27}{10\cdots 61}a^{11}-\frac{46\cdots 66}{32\cdots 83}a^{10}+\frac{28\cdots 86}{32\cdots 83}a^{9}-\frac{17\cdots 18}{32\cdots 83}a^{8}+\frac{73\cdots 42}{32\cdots 83}a^{7}-\frac{28\cdots 56}{32\cdots 83}a^{6}+\frac{86\cdots 22}{36\cdots 87}a^{5}-\frac{19\cdots 59}{32\cdots 83}a^{4}+\frac{10\cdots 13}{10\cdots 61}a^{3}-\frac{22\cdots 82}{32\cdots 83}a^{2}+\frac{36\cdots 34}{32\cdots 83}a+\frac{31\cdots 27}{32\cdots 83}$, $\frac{74\cdots 27}{89\cdots 99}a^{19}-\frac{27\cdots 23}{89\cdots 99}a^{18}+\frac{72\cdots 14}{89\cdots 99}a^{17}+\frac{35\cdots 85}{29\cdots 33}a^{16}+\frac{40\cdots 31}{99\cdots 11}a^{15}+\frac{15\cdots 56}{89\cdots 99}a^{14}+\frac{14\cdots 03}{89\cdots 99}a^{13}+\frac{23\cdots 10}{33\cdots 37}a^{12}+\frac{16\cdots 52}{29\cdots 33}a^{11}+\frac{13\cdots 25}{89\cdots 99}a^{10}+\frac{11\cdots 58}{89\cdots 99}a^{9}+\frac{13\cdots 05}{89\cdots 99}a^{8}+\frac{18\cdots 30}{89\cdots 99}a^{7}+\frac{26\cdots 53}{89\cdots 99}a^{6}+\frac{16\cdots 86}{99\cdots 11}a^{5}-\frac{19\cdots 45}{89\cdots 99}a^{4}+\frac{57\cdots 79}{29\cdots 33}a^{3}-\frac{22\cdots 84}{89\cdots 99}a^{2}-\frac{26\cdots 30}{89\cdots 99}a-\frac{38\cdots 19}{89\cdots 99}$, $\frac{22\cdots 80}{78\cdots 39}a^{19}-\frac{13\cdots 26}{78\cdots 39}a^{18}+\frac{22\cdots 56}{78\cdots 39}a^{17}-\frac{75\cdots 10}{26\cdots 13}a^{16}+\frac{14\cdots 60}{13\cdots 93}a^{15}+\frac{24\cdots 84}{78\cdots 39}a^{14}+\frac{28\cdots 56}{78\cdots 39}a^{13}+\frac{86\cdots 62}{87\cdots 71}a^{12}+\frac{29\cdots 12}{26\cdots 13}a^{11}+\frac{17\cdots 66}{78\cdots 39}a^{10}+\frac{20\cdots 76}{78\cdots 39}a^{9}-\frac{25\cdots 64}{78\cdots 39}a^{8}+\frac{28\cdots 28}{78\cdots 39}a^{7}-\frac{70\cdots 68}{78\cdots 39}a^{6}+\frac{84\cdots 08}{29\cdots 57}a^{5}-\frac{99\cdots 70}{78\cdots 39}a^{4}+\frac{32\cdots 28}{26\cdots 13}a^{3}-\frac{16\cdots 84}{78\cdots 39}a^{2}+\frac{28\cdots 68}{78\cdots 39}a-\frac{25\cdots 15}{78\cdots 39}$, $\frac{23\cdots 67}{32\cdots 83}a^{19}-\frac{12\cdots 39}{32\cdots 83}a^{18}+\frac{20\cdots 27}{32\cdots 83}a^{17}+\frac{70\cdots 23}{10\cdots 61}a^{16}+\frac{40\cdots 13}{16\cdots 63}a^{15}+\frac{29\cdots 19}{32\cdots 83}a^{14}+\frac{29\cdots 72}{32\cdots 83}a^{13}+\frac{30\cdots 96}{10\cdots 61}a^{12}+\frac{33\cdots 39}{12\cdots 29}a^{11}+\frac{77\cdots 34}{32\cdots 83}a^{10}+\frac{11\cdots 77}{19\cdots 99}a^{9}-\frac{43\cdots 81}{32\cdots 83}a^{8}+\frac{24\cdots 03}{32\cdots 83}a^{7}-\frac{46\cdots 22}{32\cdots 83}a^{6}+\frac{62\cdots 07}{10\cdots 61}a^{5}-\frac{61\cdots 65}{32\cdots 83}a^{4}+\frac{25\cdots 49}{10\cdots 61}a^{3}-\frac{13\cdots 47}{32\cdots 83}a^{2}-\frac{24\cdots 48}{32\cdots 83}a+\frac{34\cdots 81}{32\cdots 83}$, $\frac{78\cdots 71}{32\cdots 83}a^{19}+\frac{11\cdots 75}{32\cdots 83}a^{18}+\frac{75\cdots 24}{32\cdots 83}a^{17}+\frac{15\cdots 97}{10\cdots 61}a^{16}+\frac{93\cdots 88}{56\cdots 21}a^{15}+\frac{37\cdots 90}{32\cdots 83}a^{14}+\frac{28\cdots 83}{32\cdots 83}a^{13}+\frac{57\cdots 00}{12\cdots 29}a^{12}+\frac{31\cdots 79}{10\cdots 61}a^{11}+\frac{37\cdots 57}{32\cdots 83}a^{10}+\frac{18\cdots 94}{32\cdots 83}a^{9}+\frac{49\cdots 24}{32\cdots 83}a^{8}+\frac{19\cdots 68}{32\cdots 83}a^{7}+\frac{23\cdots 35}{32\cdots 83}a^{6}+\frac{30\cdots 39}{12\cdots 29}a^{5}-\frac{16\cdots 42}{32\cdots 83}a^{4}-\frac{72\cdots 48}{10\cdots 61}a^{3}-\frac{19\cdots 10}{32\cdots 83}a^{2}-\frac{14\cdots 16}{19\cdots 99}a-\frac{31\cdots 65}{32\cdots 83}$, $\frac{14\cdots 87}{32\cdots 83}a^{19}-\frac{35\cdots 50}{32\cdots 83}a^{18}+\frac{34\cdots 11}{32\cdots 83}a^{17}-\frac{10\cdots 49}{10\cdots 61}a^{16}+\frac{18\cdots 35}{56\cdots 21}a^{15}-\frac{94\cdots 44}{32\cdots 83}a^{14}-\frac{14\cdots 54}{19\cdots 99}a^{13}-\frac{27\cdots 18}{36\cdots 87}a^{12}-\frac{77\cdots 68}{10\cdots 61}a^{11}-\frac{98\cdots 96}{32\cdots 83}a^{10}+\frac{22\cdots 81}{32\cdots 83}a^{9}-\frac{29\cdots 12}{32\cdots 83}a^{8}+\frac{87\cdots 93}{32\cdots 83}a^{7}-\frac{44\cdots 94}{32\cdots 83}a^{6}+\frac{11\cdots 99}{36\cdots 87}a^{5}-\frac{24\cdots 31}{32\cdots 83}a^{4}+\frac{15\cdots 32}{10\cdots 61}a^{3}-\frac{20\cdots 24}{32\cdots 83}a^{2}+\frac{59\cdots 84}{32\cdots 83}a-\frac{15\cdots 35}{32\cdots 83}$ 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:  \( 4097659676.87 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 4097659676.87 \cdot 1601856}{2\cdot\sqrt{78148390643938933109518475030237312085224587264}}\cr\approx \mathstrut & 1.12581758228 \end{aligned}\] (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 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174) 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 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174, 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 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174); 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 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174); 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

\(\Q(\sqrt{17}) \), \(\Q(\sqrt{-51 +10 \sqrt{17}})\), 5.5.2382032.1, 10.10.8056377164681869568.1

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 ${\href{/padicField/3.4.0.1}{4} }^{4}{,}\,{\href{/padicField/3.2.0.1}{2} }^{2}$ ${\href{/padicField/5.4.0.1}{4} }^{4}{,}\,{\href{/padicField/5.2.0.1}{2} }^{2}$ $20$ $20$ ${\href{/padicField/13.10.0.1}{10} }^{2}$ R ${\href{/padicField/19.4.0.1}{4} }^{4}{,}\,{\href{/padicField/19.2.0.1}{2} }{,}\,{\href{/padicField/19.1.0.1}{1} }^{2}$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }^{2}$ ${\href{/padicField/29.4.0.1}{4} }^{5}$ ${\href{/padicField/31.4.0.1}{4} }^{4}{,}\,{\href{/padicField/31.2.0.1}{2} }^{2}$ ${\href{/padicField/37.4.0.1}{4} }^{5}$ ${\href{/padicField/41.4.0.1}{4} }^{4}{,}\,{\href{/padicField/41.2.0.1}{2} }^{2}$ ${\href{/padicField/43.5.0.1}{5} }^{4}$ ${\href{/padicField/47.2.0.1}{2} }^{10}$ 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 2.1.2.2a1.2$x^{2} + 2 x + 6$$2$$1$$2$$C_2$$$[2]$$
2.1.2.2a1.1$x^{2} + 2 x + 2$$2$$1$$2$$C_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 $\Q_{53}$$x + 51$$1$$1$$0$Trivial$$[\ ]$$
$\Q_{53}$$x + 51$$1$$1$$0$Trivial$$[\ ]$$
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)