Properties

Label 20.4.102...552.5
Degree $20$
Signature $(4, 8)$
Discriminant $1.026\times 10^{54}$
Root discriminant \(501.83\)
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 - 4*x^19 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270)
 
Copy content gp:K = bnfinit(y^20 - 4*y^19 - 32*y^18 - 152*y^17 + 662*y^16 + 12176*y^15 + 16832*y^14 + 97552*y^13 - 629006*y^12 + 779224*y^11 + 3791408*y^10 + 13608128*y^9 + 71446532*y^8 - 240943472*y^7 - 200770880*y^6 - 1354912048*y^5 - 819494303*y^4 + 18600090204*y^3 - 10414044912*y^2 - 27552270696*y + 17862528270, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 4*x^19 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 4*x^19 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270)
 

\( x^{20} - 4 x^{19} - 32 x^{18} - 152 x^{17} + 662 x^{16} + 12176 x^{15} + 16832 x^{14} + \cdots + 17862528270 \) 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:   \(1026012039426577859100909389414445029369055466909335552\) \(\medspace = 2^{64}\cdot 3^{15}\cdot 53^{16}\) 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:  \(501.83\)
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:  \(\Q(\sqrt{3}) \)
$\Aut(K/\Q)$:   $C_2$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $\frac{1}{8}a^{12}-\frac{1}{2}a^{11}+\frac{1}{4}a^{8}+\frac{1}{8}a^{4}-\frac{1}{2}a^{3}-\frac{1}{4}$, $\frac{1}{8}a^{13}+\frac{1}{4}a^{9}+\frac{1}{8}a^{5}-\frac{1}{4}a$, $\frac{1}{16}a^{14}-\frac{1}{16}a^{12}-\frac{1}{4}a^{11}-\frac{3}{8}a^{10}-\frac{1}{2}a^{9}-\frac{1}{8}a^{8}-\frac{7}{16}a^{6}-\frac{1}{2}a^{5}-\frac{1}{16}a^{4}-\frac{1}{4}a^{3}-\frac{1}{8}a^{2}+\frac{1}{8}$, $\frac{1}{16}a^{15}-\frac{1}{16}a^{13}-\frac{3}{8}a^{11}-\frac{1}{2}a^{10}-\frac{1}{8}a^{9}-\frac{1}{2}a^{8}-\frac{7}{16}a^{7}-\frac{1}{2}a^{6}-\frac{1}{16}a^{5}-\frac{1}{8}a^{3}+\frac{1}{8}a-\frac{1}{2}$, $\frac{1}{16}a^{16}-\frac{1}{16}a^{12}-\frac{1}{4}a^{11}-\frac{1}{2}a^{10}+\frac{3}{16}a^{8}-\frac{1}{2}a^{7}-\frac{1}{2}a^{6}-\frac{1}{2}a^{5}+\frac{3}{16}a^{4}+\frac{1}{4}a^{3}-\frac{1}{2}a+\frac{3}{8}$, $\frac{1}{16}a^{17}-\frac{1}{16}a^{13}-\frac{1}{2}a^{11}+\frac{3}{16}a^{9}-\frac{1}{2}a^{7}-\frac{1}{2}a^{6}+\frac{3}{16}a^{5}-\frac{1}{2}a^{4}-\frac{1}{2}a^{2}+\frac{3}{8}a-\frac{1}{2}$, $\frac{1}{424304}a^{18}-\frac{2533}{106076}a^{17}-\frac{8241}{424304}a^{16}-\frac{5845}{424304}a^{15}-\frac{795}{424304}a^{14}-\frac{21639}{424304}a^{13}+\frac{5671}{424304}a^{12}-\frac{78171}{212152}a^{11}-\frac{105073}{424304}a^{10}+\frac{30951}{212152}a^{9}-\frac{179895}{424304}a^{8}-\frac{12509}{424304}a^{7}+\frac{42825}{424304}a^{6}-\frac{179447}{424304}a^{5}-\frac{116501}{424304}a^{4}-\frac{49373}{212152}a^{3}+\frac{79429}{212152}a^{2}-\frac{2993}{212152}a-\frac{82053}{212152}$, $\frac{1}{35\cdots 28}a^{19}+\frac{27\cdots 41}{35\cdots 28}a^{18}+\frac{44\cdots 29}{17\cdots 64}a^{17}+\frac{58\cdots 89}{38\cdots 12}a^{16}-\frac{45\cdots 51}{35\cdots 28}a^{15}+\frac{68\cdots 31}{35\cdots 28}a^{14}-\frac{56\cdots 09}{17\cdots 64}a^{13}+\frac{10\cdots 05}{89\cdots 32}a^{12}+\frac{31\cdots 75}{35\cdots 28}a^{11}-\frac{10\cdots 09}{35\cdots 28}a^{10}+\frac{96\cdots 25}{38\cdots 12}a^{9}-\frac{17\cdots 23}{78\cdots 68}a^{8}+\frac{10\cdots 17}{35\cdots 28}a^{7}-\frac{60\cdots 57}{35\cdots 28}a^{6}+\frac{60\cdots 99}{17\cdots 64}a^{5}+\frac{11\cdots 15}{89\cdots 32}a^{4}-\frac{61\cdots 39}{17\cdots 64}a^{3}+\frac{60\cdots 03}{17\cdots 64}a^{2}-\frac{33\cdots 95}{89\cdots 32}a-\frac{22\cdots 18}{22\cdots 33}$ 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:   $\frac{20\cdots 69}{67\cdots 56}a^{19}+\frac{72\cdots 25}{67\cdots 56}a^{18}+\frac{70\cdots 87}{67\cdots 56}a^{17}+\frac{74\cdots 63}{14\cdots 48}a^{16}-\frac{15\cdots 30}{84\cdots 07}a^{15}-\frac{65\cdots 29}{16\cdots 14}a^{14}-\frac{24\cdots 57}{33\cdots 28}a^{13}-\frac{27\cdots 46}{84\cdots 07}a^{12}+\frac{12\cdots 27}{67\cdots 56}a^{11}-\frac{78\cdots 55}{67\cdots 56}a^{10}-\frac{17\cdots 95}{14\cdots 48}a^{9}-\frac{32\cdots 07}{67\cdots 56}a^{8}-\frac{40\cdots 43}{16\cdots 14}a^{7}+\frac{57\cdots 35}{84\cdots 07}a^{6}+\frac{37\cdots 25}{33\cdots 28}a^{5}+\frac{82\cdots 07}{16\cdots 14}a^{4}+\frac{90\cdots 49}{16\cdots 14}a^{3}-\frac{10\cdots 37}{16\cdots 14}a^{2}-\frac{70\cdots 62}{84\cdots 07}a+\frac{15\cdots 43}{16\cdots 14}$, $\frac{35\cdots 65}{67\cdots 56}a^{19}-\frac{74\cdots 79}{67\cdots 56}a^{18}-\frac{12\cdots 95}{67\cdots 56}a^{17}-\frac{16\cdots 51}{14\cdots 48}a^{16}+\frac{10\cdots 64}{84\cdots 07}a^{15}+\frac{22\cdots 91}{33\cdots 28}a^{14}+\frac{71\cdots 91}{33\cdots 28}a^{13}+\frac{15\cdots 09}{16\cdots 14}a^{12}-\frac{10\cdots 15}{67\cdots 56}a^{11}+\frac{10\cdots 01}{67\cdots 56}a^{10}+\frac{34\cdots 23}{14\cdots 48}a^{9}+\frac{77\cdots 87}{67\cdots 56}a^{8}+\frac{10\cdots 43}{16\cdots 14}a^{7}-\frac{43\cdots 59}{33\cdots 28}a^{6}-\frac{36\cdots 75}{33\cdots 28}a^{5}-\frac{72\cdots 33}{84\cdots 07}a^{4}-\frac{35\cdots 33}{16\cdots 14}a^{3}+\frac{48\cdots 68}{84\cdots 07}a^{2}+\frac{32\cdots 41}{84\cdots 07}a-\frac{14\cdots 77}{16\cdots 14}$, $\frac{35\cdots 65}{67\cdots 56}a^{19}-\frac{74\cdots 79}{67\cdots 56}a^{18}-\frac{12\cdots 95}{67\cdots 56}a^{17}-\frac{16\cdots 51}{14\cdots 48}a^{16}+\frac{10\cdots 64}{84\cdots 07}a^{15}+\frac{22\cdots 91}{33\cdots 28}a^{14}+\frac{71\cdots 91}{33\cdots 28}a^{13}+\frac{15\cdots 09}{16\cdots 14}a^{12}-\frac{10\cdots 15}{67\cdots 56}a^{11}+\frac{10\cdots 01}{67\cdots 56}a^{10}+\frac{34\cdots 23}{14\cdots 48}a^{9}+\frac{77\cdots 87}{67\cdots 56}a^{8}+\frac{10\cdots 43}{16\cdots 14}a^{7}-\frac{43\cdots 59}{33\cdots 28}a^{6}-\frac{36\cdots 75}{33\cdots 28}a^{5}-\frac{72\cdots 33}{84\cdots 07}a^{4}-\frac{35\cdots 33}{16\cdots 14}a^{3}+\frac{48\cdots 68}{84\cdots 07}a^{2}+\frac{32\cdots 41}{84\cdots 07}a-\frac{11\cdots 49}{16\cdots 14}$, $\frac{14\cdots 01}{58\cdots 48}a^{19}-\frac{74\cdots 59}{58\cdots 48}a^{18}-\frac{36\cdots 25}{58\cdots 48}a^{17}-\frac{37\cdots 65}{12\cdots 84}a^{16}+\frac{11\cdots 99}{58\cdots 48}a^{15}+\frac{16\cdots 83}{58\cdots 48}a^{14}+\frac{47\cdots 79}{58\cdots 48}a^{13}+\frac{13\cdots 41}{58\cdots 48}a^{12}-\frac{10\cdots 33}{58\cdots 48}a^{11}+\frac{24\cdots 87}{58\cdots 48}a^{10}+\frac{49\cdots 51}{12\cdots 84}a^{9}+\frac{75\cdots 93}{25\cdots 76}a^{8}+\frac{81\cdots 11}{58\cdots 48}a^{7}-\frac{44\cdots 25}{58\cdots 48}a^{6}+\frac{26\cdots 47}{58\cdots 48}a^{5}-\frac{23\cdots 83}{58\cdots 48}a^{4}+\frac{10\cdots 69}{29\cdots 24}a^{3}+\frac{12\cdots 83}{29\cdots 24}a^{2}-\frac{23\cdots 05}{29\cdots 24}a+\frac{10\cdots 77}{29\cdots 24}$, $\frac{66\cdots 11}{35\cdots 28}a^{19}-\frac{20\cdots 91}{35\cdots 28}a^{18}-\frac{23\cdots 27}{35\cdots 28}a^{17}-\frac{13\cdots 41}{38\cdots 12}a^{16}+\frac{34\cdots 91}{35\cdots 28}a^{15}+\frac{21\cdots 07}{89\cdots 32}a^{14}+\frac{19\cdots 99}{35\cdots 28}a^{13}+\frac{77\cdots 61}{35\cdots 28}a^{12}-\frac{38\cdots 23}{35\cdots 28}a^{11}-\frac{13\cdots 31}{35\cdots 28}a^{10}+\frac{50\cdots 73}{76\cdots 24}a^{9}+\frac{27\cdots 79}{89\cdots 32}a^{8}+\frac{55\cdots 39}{35\cdots 28}a^{7}-\frac{15\cdots 65}{44\cdots 66}a^{6}-\frac{15\cdots 71}{15\cdots 36}a^{5}-\frac{14\cdots 51}{35\cdots 28}a^{4}-\frac{10\cdots 75}{17\cdots 64}a^{3}+\frac{28\cdots 87}{89\cdots 32}a^{2}+\frac{39\cdots 39}{17\cdots 64}a-\frac{46\cdots 89}{17\cdots 64}$, $\frac{48\cdots 69}{17\cdots 64}a^{19}+\frac{10\cdots 71}{35\cdots 28}a^{18}+\frac{35\cdots 27}{35\cdots 28}a^{17}+\frac{29\cdots 71}{38\cdots 12}a^{16}-\frac{63\cdots 57}{17\cdots 64}a^{15}-\frac{12\cdots 29}{35\cdots 28}a^{14}-\frac{49\cdots 17}{35\cdots 28}a^{13}-\frac{11\cdots 05}{17\cdots 64}a^{12}+\frac{12\cdots 69}{17\cdots 64}a^{11}-\frac{35\cdots 27}{35\cdots 28}a^{10}-\frac{93\cdots 81}{76\cdots 24}a^{9}-\frac{12\cdots 33}{17\cdots 64}a^{8}-\frac{69\cdots 45}{17\cdots 64}a^{7}-\frac{25\cdots 29}{35\cdots 28}a^{6}+\frac{13\cdots 67}{35\cdots 28}a^{5}+\frac{96\cdots 47}{17\cdots 64}a^{4}+\frac{13\cdots 03}{89\cdots 32}a^{3}-\frac{22\cdots 79}{78\cdots 68}a^{2}-\frac{51\cdots 13}{17\cdots 64}a+\frac{23\cdots 01}{89\cdots 32}$, $\frac{26\cdots 11}{22\cdots 33}a^{19}+\frac{38\cdots 27}{17\cdots 64}a^{18}+\frac{15\cdots 15}{35\cdots 28}a^{17}+\frac{25\cdots 97}{95\cdots 78}a^{16}-\frac{70\cdots 33}{35\cdots 28}a^{15}-\frac{11\cdots 81}{78\cdots 68}a^{14}-\frac{91\cdots 31}{17\cdots 64}a^{13}-\frac{40\cdots 37}{17\cdots 64}a^{12}+\frac{19\cdots 21}{78\cdots 68}a^{11}-\frac{65\cdots 31}{17\cdots 64}a^{10}-\frac{39\cdots 23}{76\cdots 24}a^{9}-\frac{24\cdots 61}{89\cdots 32}a^{8}-\frac{50\cdots 33}{35\cdots 28}a^{7}-\frac{42\cdots 31}{17\cdots 64}a^{6}+\frac{33\cdots 67}{17\cdots 64}a^{5}+\frac{15\cdots 33}{78\cdots 68}a^{4}+\frac{93\cdots 41}{17\cdots 64}a^{3}-\frac{94\cdots 25}{89\cdots 32}a^{2}-\frac{46\cdots 47}{44\cdots 66}a+\frac{87\cdots 17}{89\cdots 32}$, $\frac{30\cdots 51}{35\cdots 28}a^{19}-\frac{27\cdots 27}{89\cdots 32}a^{18}-\frac{17\cdots 61}{35\cdots 28}a^{17}-\frac{19\cdots 41}{76\cdots 24}a^{16}+\frac{48\cdots 61}{35\cdots 28}a^{15}+\frac{39\cdots 53}{44\cdots 66}a^{14}-\frac{33\cdots 67}{35\cdots 28}a^{13}-\frac{26\cdots 03}{35\cdots 28}a^{12}+\frac{18\cdots 49}{35\cdots 28}a^{11}+\frac{22\cdots 71}{89\cdots 32}a^{10}+\frac{36\cdots 19}{76\cdots 24}a^{9}+\frac{68\cdots 79}{35\cdots 28}a^{8}-\frac{84\cdots 63}{35\cdots 28}a^{7}-\frac{94\cdots 81}{22\cdots 33}a^{6}-\frac{12\cdots 99}{35\cdots 28}a^{5}+\frac{24\cdots 13}{35\cdots 28}a^{4}+\frac{46\cdots 67}{17\cdots 64}a^{3}-\frac{91\cdots 69}{22\cdots 33}a^{2}-\frac{25\cdots 41}{78\cdots 68}a+\frac{91\cdots 29}{17\cdots 64}$, $\frac{11\cdots 45}{17\cdots 64}a^{19}+\frac{15\cdots 59}{35\cdots 28}a^{18}+\frac{72\cdots 45}{78\cdots 68}a^{17}+\frac{55\cdots 01}{76\cdots 24}a^{16}-\frac{21\cdots 93}{35\cdots 28}a^{15}-\frac{11\cdots 87}{17\cdots 64}a^{14}+\frac{20\cdots 73}{35\cdots 28}a^{13}-\frac{34\cdots 99}{44\cdots 66}a^{12}+\frac{54\cdots 17}{89\cdots 32}a^{11}-\frac{74\cdots 09}{35\cdots 28}a^{10}+\frac{62\cdots 17}{20\cdots 93}a^{9}-\frac{58\cdots 01}{35\cdots 28}a^{8}-\frac{14\cdots 25}{35\cdots 28}a^{7}+\frac{30\cdots 91}{17\cdots 64}a^{6}-\frac{12\cdots 19}{35\cdots 28}a^{5}+\frac{16\cdots 59}{89\cdots 32}a^{4}-\frac{76\cdots 83}{17\cdots 64}a^{3}-\frac{24\cdots 99}{44\cdots 66}a^{2}+\frac{14\cdots 31}{17\cdots 64}a-\frac{38\cdots 99}{89\cdots 32}$, $\frac{23\cdots 77}{35\cdots 28}a^{19}-\frac{76\cdots 35}{35\cdots 28}a^{18}-\frac{78\cdots 75}{35\cdots 28}a^{17}-\frac{42\cdots 45}{38\cdots 12}a^{16}+\frac{78\cdots 89}{22\cdots 33}a^{15}+\frac{18\cdots 60}{22\cdots 33}a^{14}+\frac{28\cdots 65}{17\cdots 64}a^{13}+\frac{26\cdots 15}{35\cdots 28}a^{12}-\frac{12\cdots 67}{35\cdots 28}a^{11}+\frac{94\cdots 69}{35\cdots 28}a^{10}+\frac{19\cdots 67}{76\cdots 24}a^{9}+\frac{46\cdots 53}{44\cdots 66}a^{8}+\frac{47\cdots 27}{89\cdots 32}a^{7}-\frac{10\cdots 15}{89\cdots 32}a^{6}-\frac{37\cdots 89}{17\cdots 64}a^{5}-\frac{36\cdots 13}{35\cdots 28}a^{4}-\frac{53\cdots 99}{44\cdots 66}a^{3}+\frac{43\cdots 79}{39\cdots 84}a^{2}+\frac{33\cdots 75}{44\cdots 66}a-\frac{30\cdots 47}{17\cdots 64}$, $\frac{63\cdots 47}{44\cdots 66}a^{19}+\frac{50\cdots 25}{44\cdots 66}a^{18}+\frac{11\cdots 07}{35\cdots 28}a^{17}-\frac{15\cdots 31}{76\cdots 24}a^{16}-\frac{59\cdots 63}{17\cdots 64}a^{15}-\frac{41\cdots 91}{35\cdots 28}a^{14}+\frac{31\cdots 07}{15\cdots 36}a^{13}+\frac{48\cdots 67}{17\cdots 64}a^{12}-\frac{58\cdots 13}{89\cdots 32}a^{11}+\frac{66\cdots 77}{17\cdots 64}a^{10}-\frac{43\cdots 81}{76\cdots 24}a^{9}+\frac{85\cdots 47}{35\cdots 28}a^{8}+\frac{19\cdots 01}{17\cdots 64}a^{7}+\frac{14\cdots 69}{35\cdots 28}a^{6}+\frac{12\cdots 33}{35\cdots 28}a^{5}-\frac{11\cdots 83}{17\cdots 64}a^{4}-\frac{13\cdots 97}{89\cdots 32}a^{3}+\frac{35\cdots 83}{17\cdots 64}a^{2}+\frac{32\cdots 61}{17\cdots 64}a-\frac{69\cdots 57}{44\cdots 66}$ 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:  \( 42907053192269430000 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{4}\cdot(2\pi)^{8}\cdot 42907053192269430000 \cdot 2}{2\cdot\sqrt{1026012039426577859100909389414445029369055466909335552}}\cr\approx \mathstrut & 1.64630914174129 \end{aligned}\] (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 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270) 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 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270, 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 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270); 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 - 32*x^18 - 152*x^17 + 662*x^16 + 12176*x^15 + 16832*x^14 + 97552*x^13 - 629006*x^12 + 779224*x^11 + 3791408*x^10 + 13608128*x^9 + 71446532*x^8 - 240943472*x^7 - 200770880*x^6 - 1354912048*x^5 - 819494303*x^4 + 18600090204*x^3 - 10414044912*x^2 - 27552270696*x + 17862528270); 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

\(\Q(\sqrt{6}) \), \(\Q(\sqrt{3 + \sqrt{6}})\), 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: 20.4.513006019713288929550454694707222514684527733454667776.1

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 ${\href{/padicField/5.4.0.1}{4} }^{4}{,}\,{\href{/padicField/5.2.0.1}{2} }{,}\,{\href{/padicField/5.1.0.1}{1} }^{2}$ ${\href{/padicField/7.4.0.1}{4} }^{5}$ ${\href{/padicField/11.4.0.1}{4} }^{4}{,}\,{\href{/padicField/11.2.0.1}{2} }^{2}$ ${\href{/padicField/13.4.0.1}{4} }^{4}{,}\,{\href{/padicField/13.2.0.1}{2} }^{2}$ ${\href{/padicField/17.4.0.1}{4} }^{5}$ ${\href{/padicField/19.4.0.1}{4} }^{4}{,}\,{\href{/padicField/19.2.0.1}{2} }{,}\,{\href{/padicField/19.1.0.1}{1} }^{2}$ ${\href{/padicField/23.2.0.1}{2} }^{10}$ ${\href{/padicField/29.4.0.1}{4} }^{4}{,}\,{\href{/padicField/29.2.0.1}{2} }{,}\,{\href{/padicField/29.1.0.1}{1} }^{2}$ ${\href{/padicField/31.4.0.1}{4} }^{5}$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }^{2}$ $20$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }{,}\,{\href{/padicField/43.1.0.1}{1} }^{2}$ ${\href{/padicField/47.2.0.1}{2} }^{10}$ R ${\href{/padicField/59.4.0.1}{4} }^{4}{,}\,{\href{/padicField/59.2.0.1}{2} }^{2}$

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 2.4.10.5$x^{4} + 4 x^{3} + 4 x^{2} + 10$$4$$1$$10$$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 3.4.3.1$x^{4} + 3$$4$$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 53.5.4.1$x^{5} + 53$$5$$1$$4$$F_5$$$[\ ]_{5}^{4}$$
53.5.4.1$x^{5} + 53$$5$$1$$4$$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)