Properties

Label 20.4.513...776.1
Degree $20$
Signature $(4, 8)$
Discriminant $5.130\times 10^{53}$
Root discriminant \(484.74\)
Ramified primes $2,3,53$
Class number $2$ (GRH)
Class group [2] (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 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336)
 
Copy content gp:K = bnfinit(y^20 - 8*y^19 + 170*y^18 - 264*y^17 + 9206*y^16 + 39680*y^15 + 448672*y^14 + 3205056*y^13 + 23901424*y^12 + 156793344*y^11 + 882147904*y^10 + 5143483648*y^9 + 23314586816*y^8 + 100368147456*y^7 + 353271460352*y^6 + 1122667758080*y^5 + 2969896724416*y^4 + 5938321552896*y^3 + 11551268406912*y^2 + 8441222075904*y + 284662974336, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336)
 

\( x^{20} - 8 x^{19} + 170 x^{18} - 264 x^{17} + 9206 x^{16} + 39680 x^{15} + 448672 x^{14} + \cdots + 284662974336 \) 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:  $(4, 8)$
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:   \(513006019713288929550454694707222514684527733454667776\) \(\medspace = 2^{63}\cdot 3^{15}\cdot 53^{16}\) 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:  \(484.74\)
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:   \(2\), \(3\), \(53\) 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:  \(\Q(\sqrt{6}) \)
$\Aut(K/\Q)$:   $C_2$
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 not a CM field.
This field has no CM subfields.

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

$1$, $a$, $a^{2}$, $a^{3}$, $\frac{1}{2}a^{4}$, $\frac{1}{2}a^{5}$, $\frac{1}{2}a^{6}$, $\frac{1}{4}a^{7}-\frac{1}{2}a^{3}$, $\frac{1}{4}a^{8}$, $\frac{1}{4}a^{9}$, $\frac{1}{8}a^{10}-\frac{1}{4}a^{6}$, $\frac{1}{8}a^{11}-\frac{1}{2}a^{3}$, $\frac{1}{192}a^{12}+\frac{1}{24}a^{11}-\frac{5}{96}a^{10}+\frac{1}{24}a^{9}-\frac{7}{96}a^{8}+\frac{1}{12}a^{7}+\frac{1}{6}a^{6}-\frac{1}{6}a^{5}-\frac{1}{6}a^{4}-\frac{1}{2}a^{3}-\frac{1}{4}a^{2}-\frac{1}{4}$, $\frac{1}{384}a^{13}-\frac{1}{192}a^{11}-\frac{1}{48}a^{10}-\frac{5}{64}a^{9}+\frac{1}{12}a^{8}-\frac{1}{8}a^{7}-\frac{1}{6}a^{5}-\frac{1}{12}a^{4}-\frac{1}{8}a^{3}+\frac{3}{8}a$, $\frac{1}{384}a^{14}+\frac{1}{48}a^{11}-\frac{1}{192}a^{10}-\frac{1}{8}a^{9}+\frac{5}{96}a^{8}+\frac{1}{12}a^{7}-\frac{1}{4}a^{6}-\frac{1}{4}a^{5}+\frac{5}{24}a^{4}-\frac{1}{2}a^{3}+\frac{1}{8}a^{2}-\frac{1}{4}$, $\frac{1}{384}a^{15}-\frac{3}{64}a^{11}-\frac{1}{24}a^{10}-\frac{11}{96}a^{9}-\frac{1}{8}a^{8}-\frac{1}{12}a^{7}-\frac{1}{6}a^{6}-\frac{1}{8}a^{5}+\frac{1}{6}a^{4}-\frac{3}{8}a^{3}-\frac{1}{4}a$, $\frac{1}{281856}a^{16}+\frac{15}{23488}a^{15}+\frac{35}{46976}a^{14}-\frac{23}{23488}a^{13}-\frac{203}{140928}a^{12}-\frac{343}{5872}a^{11}-\frac{1949}{35232}a^{10}-\frac{2257}{35232}a^{9}+\frac{319}{2936}a^{8}+\frac{1043}{8808}a^{7}+\frac{2953}{17616}a^{6}+\frac{315}{1468}a^{5}+\frac{725}{17616}a^{4}+\frac{179}{734}a^{3}-\frac{37}{1468}a^{2}-\frac{119}{1468}a-\frac{130}{367}$, $\frac{1}{281856}a^{17}+\frac{53}{140928}a^{15}+\frac{23}{70464}a^{14}+\frac{1}{2936}a^{13}-\frac{53}{23488}a^{12}-\frac{3257}{70464}a^{11}-\frac{99}{2936}a^{10}-\frac{3005}{70464}a^{9}+\frac{1055}{35232}a^{8}-\frac{619}{5872}a^{7}+\frac{457}{2202}a^{6}+\frac{1477}{17616}a^{5}+\frac{63}{734}a^{4}-\frac{137}{2936}a^{3}-\frac{108}{367}a^{2}+\frac{329}{2936}a-\frac{719}{1468}$, $\frac{1}{98\cdots 72}a^{18}+\frac{72\cdots 17}{61\cdots 92}a^{17}+\frac{31\cdots 99}{24\cdots 68}a^{16}+\frac{12\cdots 69}{12\cdots 84}a^{15}+\frac{58\cdots 79}{49\cdots 36}a^{14}-\frac{75\cdots 19}{24\cdots 68}a^{13}-\frac{55\cdots 55}{24\cdots 68}a^{12}+\frac{74\cdots 91}{12\cdots 84}a^{11}-\frac{11\cdots 09}{61\cdots 92}a^{10}-\frac{12\cdots 79}{12\cdots 84}a^{9}+\frac{88\cdots 27}{30\cdots 96}a^{8}-\frac{50\cdots 15}{38\cdots 62}a^{7}+\frac{79\cdots 99}{61\cdots 92}a^{6}-\frac{92\cdots 79}{77\cdots 24}a^{5}-\frac{60\cdots 17}{30\cdots 96}a^{4}+\frac{11\cdots 63}{51\cdots 16}a^{3}-\frac{80\cdots 45}{25\cdots 08}a^{2}+\frac{15\cdots 39}{51\cdots 16}a+\frac{98\cdots 59}{25\cdots 08}$, $\frac{1}{14\cdots 76}a^{19}-\frac{29\cdots 07}{40\cdots 28}a^{18}+\frac{80\cdots 53}{24\cdots 96}a^{17}-\frac{11\cdots 81}{74\cdots 88}a^{16}-\frac{75\cdots 65}{74\cdots 88}a^{15}+\frac{19\cdots 79}{82\cdots 32}a^{14}-\frac{10\cdots 05}{41\cdots 16}a^{13}-\frac{21\cdots 49}{93\cdots 36}a^{12}+\frac{12\cdots 13}{64\cdots 94}a^{11}+\frac{20\cdots 77}{93\cdots 36}a^{10}+\frac{18\cdots 27}{18\cdots 72}a^{9}+\frac{19\cdots 59}{32\cdots 97}a^{8}-\frac{35\cdots 69}{31\cdots 12}a^{7}-\frac{86\cdots 01}{93\cdots 36}a^{6}+\frac{83\cdots 65}{77\cdots 28}a^{5}+\frac{32\cdots 29}{23\cdots 84}a^{4}+\frac{11\cdots 67}{38\cdots 64}a^{3}+\frac{68\cdots 67}{12\cdots 88}a^{2}+\frac{10\cdots 89}{25\cdots 76}a-\frac{10\cdots 81}{38\cdots 64}$ 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:  $C_{2}$, which has order $2$ (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:  $C_{2}\times C_{2}$, which has order $4$ (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);
 

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:  $11$
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:   $\frac{39\cdots 95}{33\cdots 44}a^{19}-\frac{19\cdots 95}{33\cdots 44}a^{18}+\frac{17\cdots 49}{11\cdots 48}a^{17}+\frac{66\cdots 03}{16\cdots 72}a^{16}+\frac{27\cdots 87}{33\cdots 44}a^{15}+\frac{14\cdots 19}{16\cdots 72}a^{14}+\frac{96\cdots 39}{16\cdots 72}a^{13}+\frac{10\cdots 49}{21\cdots 84}a^{12}+\frac{59\cdots 45}{16\cdots 72}a^{11}+\frac{10\cdots 27}{42\cdots 68}a^{10}+\frac{39\cdots 19}{28\cdots 12}a^{9}+\frac{16\cdots 79}{21\cdots 84}a^{8}+\frac{20\cdots 25}{52\cdots 46}a^{7}+\frac{10\cdots 95}{70\cdots 28}a^{6}+\frac{10\cdots 73}{17\cdots 82}a^{5}+\frac{46\cdots 17}{26\cdots 73}a^{4}+\frac{32\cdots 31}{70\cdots 28}a^{3}+\frac{15\cdots 25}{17\cdots 82}a^{2}+\frac{56\cdots 99}{35\cdots 64}a+\frac{28\cdots 79}{88\cdots 91}$, $\frac{39\cdots 95}{33\cdots 44}a^{19}-\frac{19\cdots 95}{33\cdots 44}a^{18}+\frac{17\cdots 49}{11\cdots 48}a^{17}+\frac{66\cdots 03}{16\cdots 72}a^{16}+\frac{27\cdots 87}{33\cdots 44}a^{15}+\frac{14\cdots 19}{16\cdots 72}a^{14}+\frac{96\cdots 39}{16\cdots 72}a^{13}+\frac{10\cdots 49}{21\cdots 84}a^{12}+\frac{59\cdots 45}{16\cdots 72}a^{11}+\frac{10\cdots 27}{42\cdots 68}a^{10}+\frac{39\cdots 19}{28\cdots 12}a^{9}+\frac{16\cdots 79}{21\cdots 84}a^{8}+\frac{20\cdots 25}{52\cdots 46}a^{7}+\frac{10\cdots 95}{70\cdots 28}a^{6}+\frac{10\cdots 73}{17\cdots 82}a^{5}+\frac{46\cdots 17}{26\cdots 73}a^{4}+\frac{32\cdots 31}{70\cdots 28}a^{3}+\frac{15\cdots 25}{17\cdots 82}a^{2}+\frac{56\cdots 99}{35\cdots 64}a+\frac{10\cdots 97}{88\cdots 91}$, $\frac{40\cdots 11}{56\cdots 24}a^{19}+\frac{31\cdots 55}{56\cdots 24}a^{18}-\frac{20\cdots 97}{16\cdots 72}a^{17}+\frac{16\cdots 51}{84\cdots 36}a^{16}-\frac{11\cdots 81}{16\cdots 72}a^{15}-\frac{23\cdots 09}{84\cdots 36}a^{14}-\frac{29\cdots 25}{84\cdots 36}a^{13}-\frac{16\cdots 41}{70\cdots 28}a^{12}-\frac{15\cdots 71}{84\cdots 36}a^{11}-\frac{24\cdots 45}{21\cdots 84}a^{10}-\frac{28\cdots 39}{42\cdots 68}a^{9}-\frac{20\cdots 69}{52\cdots 46}a^{8}-\frac{15\cdots 37}{88\cdots 91}a^{7}-\frac{81\cdots 43}{10\cdots 92}a^{6}-\frac{69\cdots 05}{26\cdots 73}a^{5}-\frac{21\cdots 97}{26\cdots 73}a^{4}-\frac{74\cdots 45}{35\cdots 64}a^{3}-\frac{35\cdots 99}{88\cdots 91}a^{2}-\frac{12\cdots 93}{17\cdots 82}a-\frac{32\cdots 35}{88\cdots 91}$, $\frac{67\cdots 19}{82\cdots 32}a^{19}-\frac{15\cdots 45}{24\cdots 96}a^{18}+\frac{70\cdots 83}{51\cdots 52}a^{17}-\frac{15\cdots 99}{82\cdots 32}a^{16}+\frac{15\cdots 31}{20\cdots 08}a^{15}+\frac{67\cdots 81}{20\cdots 08}a^{14}+\frac{56\cdots 47}{15\cdots 56}a^{13}+\frac{32\cdots 03}{12\cdots 48}a^{12}+\frac{11\cdots 67}{62\cdots 24}a^{11}+\frac{13\cdots 01}{10\cdots 04}a^{10}+\frac{11\cdots 07}{15\cdots 56}a^{9}+\frac{12\cdots 53}{31\cdots 12}a^{8}+\frac{28\cdots 93}{15\cdots 56}a^{7}+\frac{77\cdots 43}{96\cdots 91}a^{6}+\frac{26\cdots 12}{96\cdots 91}a^{5}+\frac{13\cdots 93}{15\cdots 56}a^{4}+\frac{59\cdots 01}{25\cdots 76}a^{3}+\frac{59\cdots 13}{12\cdots 88}a^{2}+\frac{28\cdots 32}{32\cdots 97}a+\frac{81\cdots 17}{12\cdots 88}$, $\frac{70\cdots 75}{24\cdots 96}a^{19}-\frac{43\cdots 15}{12\cdots 88}a^{18}-\frac{71\cdots 77}{12\cdots 48}a^{17}-\frac{99\cdots 95}{15\cdots 56}a^{16}-\frac{99\cdots 89}{41\cdots 16}a^{15}-\frac{10\cdots 73}{31\cdots 12}a^{14}-\frac{29\cdots 89}{10\cdots 04}a^{13}-\frac{11\cdots 77}{51\cdots 52}a^{12}-\frac{11\cdots 61}{77\cdots 28}a^{11}-\frac{14\cdots 87}{15\cdots 56}a^{10}-\frac{75\cdots 13}{12\cdots 88}a^{9}-\frac{22\cdots 75}{77\cdots 28}a^{8}-\frac{64\cdots 85}{51\cdots 52}a^{7}-\frac{14\cdots 16}{32\cdots 97}a^{6}-\frac{28\cdots 13}{19\cdots 82}a^{5}-\frac{74\cdots 91}{19\cdots 82}a^{4}-\frac{25\cdots 92}{32\cdots 97}a^{3}-\frac{92\cdots 29}{64\cdots 94}a^{2}-\frac{63\cdots 35}{64\cdots 94}a-\frac{10\cdots 54}{32\cdots 97}$, $\frac{38\cdots 77}{24\cdots 96}a^{19}+\frac{11\cdots 99}{62\cdots 24}a^{18}-\frac{24\cdots 39}{82\cdots 32}a^{17}+\frac{38\cdots 29}{31\cdots 12}a^{16}-\frac{42\cdots 05}{31\cdots 12}a^{15}-\frac{21\cdots 37}{10\cdots 04}a^{14}-\frac{15\cdots 73}{41\cdots 16}a^{13}-\frac{97\cdots 67}{38\cdots 64}a^{12}-\frac{17\cdots 31}{10\cdots 04}a^{11}-\frac{15\cdots 37}{15\cdots 56}a^{10}-\frac{65\cdots 57}{15\cdots 56}a^{9}-\frac{68\cdots 69}{25\cdots 76}a^{8}-\frac{43\cdots 87}{64\cdots 94}a^{7}-\frac{73\cdots 19}{38\cdots 64}a^{6}-\frac{39\cdots 21}{51\cdots 52}a^{5}+\frac{17\cdots 11}{19\cdots 82}a^{4}+\frac{52\cdots 57}{12\cdots 88}a^{3}+\frac{20\cdots 63}{64\cdots 94}a^{2}+\frac{10\cdots 14}{32\cdots 97}a+\frac{36\cdots 53}{32\cdots 97}$, $\frac{11\cdots 51}{16\cdots 64}a^{19}+\frac{32\cdots 29}{49\cdots 92}a^{18}-\frac{16\cdots 11}{12\cdots 48}a^{17}+\frac{20\cdots 57}{62\cdots 24}a^{16}-\frac{17\cdots 79}{24\cdots 96}a^{15}-\frac{52\cdots 69}{24\cdots 96}a^{14}-\frac{62\cdots 03}{20\cdots 08}a^{13}-\frac{24\cdots 11}{12\cdots 48}a^{12}-\frac{93\cdots 75}{62\cdots 24}a^{11}-\frac{99\cdots 83}{10\cdots 04}a^{10}-\frac{32\cdots 41}{62\cdots 24}a^{9}-\frac{96\cdots 31}{31\cdots 12}a^{8}-\frac{13\cdots 93}{10\cdots 04}a^{7}-\frac{17\cdots 53}{31\cdots 12}a^{6}-\frac{29\cdots 23}{15\cdots 56}a^{5}-\frac{92\cdots 71}{15\cdots 56}a^{4}-\frac{38\cdots 35}{25\cdots 76}a^{3}-\frac{34\cdots 41}{12\cdots 88}a^{2}-\frac{14\cdots 45}{25\cdots 76}a-\frac{60\cdots 69}{32\cdots 97}$, $\frac{14\cdots 87}{49\cdots 92}a^{19}+\frac{13\cdots 21}{49\cdots 92}a^{18}-\frac{15\cdots 61}{31\cdots 12}a^{17}+\frac{61\cdots 97}{82\cdots 32}a^{16}-\frac{49\cdots 61}{24\cdots 96}a^{15}-\frac{34\cdots 79}{24\cdots 96}a^{14}-\frac{63\cdots 43}{77\cdots 28}a^{13}-\frac{13\cdots 85}{15\cdots 56}a^{12}-\frac{33\cdots 65}{62\cdots 24}a^{11}-\frac{10\cdots 91}{31\cdots 12}a^{10}-\frac{39\cdots 97}{20\cdots 08}a^{9}-\frac{11\cdots 93}{10\cdots 04}a^{8}-\frac{47\cdots 43}{10\cdots 04}a^{7}-\frac{52\cdots 47}{31\cdots 12}a^{6}-\frac{96\cdots 63}{15\cdots 56}a^{5}-\frac{10\cdots 95}{64\cdots 94}a^{4}-\frac{92\cdots 61}{25\cdots 76}a^{3}-\frac{96\cdots 25}{12\cdots 88}a^{2}-\frac{13\cdots 31}{25\cdots 76}a-\frac{58\cdots 55}{32\cdots 97}$, $\frac{33\cdots 11}{16\cdots 64}a^{19}+\frac{28\cdots 63}{16\cdots 64}a^{18}-\frac{21\cdots 43}{82\cdots 32}a^{17}+\frac{58\cdots 91}{15\cdots 56}a^{16}-\frac{19\cdots 63}{82\cdots 32}a^{15}+\frac{48\cdots 45}{24\cdots 96}a^{14}-\frac{52\cdots 13}{20\cdots 08}a^{13}+\frac{39\cdots 53}{12\cdots 48}a^{12}+\frac{82\cdots 83}{31\cdots 12}a^{11}+\frac{44\cdots 87}{62\cdots 24}a^{10}+\frac{32\cdots 33}{31\cdots 12}a^{9}+\frac{53\cdots 25}{15\cdots 56}a^{8}+\frac{76\cdots 71}{31\cdots 12}a^{7}+\frac{25\cdots 67}{31\cdots 12}a^{6}+\frac{78\cdots 07}{25\cdots 76}a^{5}+\frac{56\cdots 69}{51\cdots 52}a^{4}+\frac{23\cdots 89}{12\cdots 88}a^{3}+\frac{14\cdots 01}{25\cdots 76}a^{2}+\frac{17\cdots 74}{32\cdots 97}a+\frac{23\cdots 11}{12\cdots 88}$, $\frac{26\cdots 61}{49\cdots 92}a^{19}-\frac{18\cdots 21}{49\cdots 92}a^{18}+\frac{10\cdots 85}{12\cdots 48}a^{17}-\frac{82\cdots 63}{24\cdots 96}a^{16}+\frac{98\cdots 21}{24\cdots 96}a^{15}+\frac{59\cdots 97}{24\cdots 96}a^{14}+\frac{26\cdots 25}{12\cdots 48}a^{13}+\frac{32\cdots 91}{20\cdots 08}a^{12}+\frac{23\cdots 45}{20\cdots 08}a^{11}+\frac{44\cdots 91}{62\cdots 24}a^{10}+\frac{11\cdots 25}{31\cdots 12}a^{9}+\frac{63\cdots 33}{31\cdots 12}a^{8}+\frac{87\cdots 77}{10\cdots 04}a^{7}+\frac{92\cdots 23}{31\cdots 12}a^{6}+\frac{11\cdots 77}{15\cdots 56}a^{5}+\frac{10\cdots 87}{77\cdots 28}a^{4}+\frac{29\cdots 33}{25\cdots 76}a^{3}-\frac{10\cdots 31}{25\cdots 76}a^{2}-\frac{30\cdots 93}{64\cdots 94}a-\frac{10\cdots 31}{64\cdots 94}$, $\frac{12\cdots 23}{16\cdots 64}a^{19}+\frac{95\cdots 83}{49\cdots 92}a^{18}-\frac{20\cdots 67}{24\cdots 96}a^{17}-\frac{56\cdots 33}{24\cdots 96}a^{16}-\frac{10\cdots 71}{24\cdots 96}a^{15}-\frac{24\cdots 81}{82\cdots 32}a^{14}-\frac{28\cdots 87}{12\cdots 48}a^{13}-\frac{43\cdots 47}{31\cdots 12}a^{12}-\frac{25\cdots 32}{32\cdots 97}a^{11}-\frac{24\cdots 31}{62\cdots 24}a^{10}-\frac{80\cdots 35}{62\cdots 24}a^{9}-\frac{41\cdots 87}{10\cdots 04}a^{8}-\frac{53\cdots 83}{10\cdots 04}a^{7}+\frac{23\cdots 43}{31\cdots 12}a^{6}+\frac{93\cdots 11}{77\cdots 28}a^{5}+\frac{10\cdots 57}{19\cdots 82}a^{4}+\frac{17\cdots 93}{12\cdots 88}a^{3}+\frac{97\cdots 91}{25\cdots 76}a^{2}+\frac{81\cdots 25}{25\cdots 76}a+\frac{34\cdots 29}{32\cdots 97}$ 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:  \( 24649276698462750000 \) (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)
 
Unit signature rank:  \( 3 \) (assuming GRH)

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{4}\cdot(2\pi)^{8}\cdot 24649276698462750000 \cdot 2}{2\cdot\sqrt{513006019713288929550454694707222514684527733454667776}}\cr\approx \mathstrut & 1.33752490949745 \end{aligned}\] (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 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336) 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 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336, 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 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336); 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 - 8*x^19 + 170*x^18 - 264*x^17 + 9206*x^16 + 39680*x^15 + 448672*x^14 + 3205056*x^13 + 23901424*x^12 + 156793344*x^11 + 882147904*x^10 + 5143483648*x^9 + 23314586816*x^8 + 100368147456*x^7 + 353271460352*x^6 + 1122667758080*x^5 + 2969896724416*x^4 + 5938321552896*x^3 + 11551268406912*x^2 + 8441222075904*x + 284662974336); 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

\(\Q(\sqrt{3}) \), \(\Q(\sqrt{3 + \sqrt{3}})\), 5.1.145437345792.1, 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: 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 ${\href{/padicField/5.4.0.1}{4} }^{4}{,}\,{\href{/padicField/5.2.0.1}{2} }^{2}$ ${\href{/padicField/7.4.0.1}{4} }^{5}$ ${\href{/padicField/11.4.0.1}{4} }^{4}{,}\,{\href{/padicField/11.2.0.1}{2} }{,}\,{\href{/padicField/11.1.0.1}{1} }^{2}$ ${\href{/padicField/13.4.0.1}{4} }^{4}{,}\,{\href{/padicField/13.2.0.1}{2} }{,}\,{\href{/padicField/13.1.0.1}{1} }^{2}$ ${\href{/padicField/17.4.0.1}{4} }^{5}$ ${\href{/padicField/19.4.0.1}{4} }^{4}{,}\,{\href{/padicField/19.2.0.1}{2} }^{2}$ ${\href{/padicField/23.2.0.1}{2} }^{10}$ ${\href{/padicField/29.4.0.1}{4} }^{4}{,}\,{\href{/padicField/29.2.0.1}{2} }^{2}$ ${\href{/padicField/31.4.0.1}{4} }^{5}$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }{,}\,{\href{/padicField/37.1.0.1}{1} }^{2}$ $20$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }^{2}$ ${\href{/padicField/47.2.0.1}{2} }^{10}$ R ${\href{/padicField/59.4.0.1}{4} }^{4}{,}\,{\href{/padicField/59.2.0.1}{2} }{,}\,{\href{/padicField/59.1.0.1}{1} }^{2}$

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 2.4.9.8$x^{4} + 10 x^{2} + 6$$4$$1$$9$$D_{4}$$$[2, 3, \frac{7}{2}]$$
2.16.54.4$x^{16} + 4 x^{14} + 8 x^{13} + 8 x^{9} + 10 x^{8} + 8 x^{7} + 8 x^{6} + 4 x^{4} + 14$$16$$1$$54$$C_4:C_4$$$[2, 3, \frac{7}{2}, 4]$$
\(3\) 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$$$[\ ]_{4}^{4}$$
\(53\) Copy content Toggle raw display 53.10.8.1$x^{10} + 245 x^{9} + 24020 x^{8} + 1178450 x^{7} + 28968105 x^{6} + 287187089 x^{5} + 57936210 x^{4} + 4713800 x^{3} + 192160 x^{2} + 3920 x + 85$$5$$2$$8$$F_5$$$[\ ]_{5}^{4}$$
53.10.8.1$x^{10} + 245 x^{9} + 24020 x^{8} + 1178450 x^{7} + 28968105 x^{6} + 287187089 x^{5} + 57936210 x^{4} + 4713800 x^{3} + 192160 x^{2} + 3920 x + 85$$5$$2$$8$$F_5$$$[\ ]_{5}^{4}$$

Spectrum of ring of integers

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