Properties

Label 20.0.393...944.1
Degree $20$
Signature $(0, 10)$
Discriminant $3.936\times 10^{47}$
Root discriminant \(239.75\)
Ramified primes $2,7,11,13$
Class number $64$ (GRH)
Class group [2, 4, 8] (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 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012)
 
Copy content gp:K = bnfinit(y^20 - y^19 + 55*y^18 - 278*y^17 + 2263*y^16 - 11313*y^15 + 79085*y^14 - 392560*y^13 + 1827617*y^12 - 8550529*y^11 + 37812683*y^10 - 141163000*y^9 + 484077264*y^8 - 1681413400*y^7 + 5243487620*y^6 - 13458733172*y^5 + 31389769344*y^4 - 73483265336*y^3 + 152848977996*y^2 - 230279722452*y + 197469154012, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012)
 

\( x^{20} - x^{19} + 55 x^{18} - 278 x^{17} + 2263 x^{16} - 11313 x^{15} + 79085 x^{14} + \cdots + 197469154012 \) 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:   \(393644681588957236910214274346592274945338834944\) \(\medspace = 2^{16}\cdot 7^{15}\cdot 11^{15}\cdot 13^{13}\) 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:  \(239.75\)
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:   \(2\), \(7\), \(11\), \(13\) 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:  \(\Q(\sqrt{1001}) \)
$\Aut(K/\Q)$:   $C_2$
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.
Maximal CM subfield:  \(\Q(\sqrt{-154 +10 \sqrt{77}})\)

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $a^{12}$, $a^{13}$, $a^{14}$, $\frac{1}{208}a^{15}+\frac{9}{208}a^{14}+\frac{1}{208}a^{13}-\frac{27}{104}a^{12}+\frac{9}{208}a^{11}-\frac{51}{208}a^{10}-\frac{23}{208}a^{9}+\frac{3}{104}a^{8}+\frac{15}{208}a^{7}-\frac{71}{208}a^{6}+\frac{79}{208}a^{5}-\frac{41}{104}a^{4}+\frac{3}{8}a^{3}-\frac{1}{8}a-\frac{1}{8}$, $\frac{1}{416}a^{16}-\frac{1}{416}a^{15}-\frac{89}{416}a^{14}-\frac{2}{13}a^{13}+\frac{133}{416}a^{12}-\frac{141}{416}a^{11}+\frac{71}{416}a^{10}+\frac{7}{104}a^{9}+\frac{163}{416}a^{8}+\frac{15}{32}a^{7}+\frac{165}{416}a^{6}+\frac{21}{52}a^{5}-\frac{71}{208}a^{4}+\frac{1}{8}a^{3}+\frac{7}{16}a^{2}+\frac{1}{16}a-\frac{3}{8}$, $\frac{1}{416}a^{17}-\frac{175}{416}a^{14}+\frac{159}{416}a^{13}+\frac{31}{104}a^{12}-\frac{23}{104}a^{11}+\frac{85}{416}a^{10}+\frac{201}{416}a^{9}+\frac{33}{208}a^{8}+\frac{23}{208}a^{7}+\frac{183}{416}a^{6}+\frac{2}{13}a^{5}+\frac{9}{208}a^{4}+\frac{7}{16}a^{3}-\frac{1}{2}a^{2}+\frac{1}{16}a$, $\frac{1}{34750796704}a^{18}+\frac{759922}{1085962397}a^{17}-\frac{2056787}{2171924794}a^{16}+\frac{836495}{2044164512}a^{15}+\frac{373168625}{2673138208}a^{14}+\frac{6662843853}{17375398352}a^{13}-\frac{36139306}{1085962397}a^{12}-\frac{298327645}{2044164512}a^{11}-\frac{4377766529}{34750796704}a^{10}-\frac{688822631}{2171924794}a^{9}+\frac{4845645}{78621712}a^{8}-\frac{39574985}{181941344}a^{7}-\frac{3613855905}{17375398352}a^{6}-\frac{1441715835}{8687699176}a^{5}+\frac{7534776109}{17375398352}a^{4}+\frac{300463145}{668284552}a^{3}+\frac{140451137}{1336569104}a^{2}-\frac{330082031}{668284552}a+\frac{263495681}{668284552}$, $\frac{1}{47\cdots 56}a^{19}-\frac{40\cdots 15}{47\cdots 56}a^{18}+\frac{88\cdots 95}{47\cdots 56}a^{17}-\frac{24\cdots 71}{47\cdots 56}a^{16}+\frac{35\cdots 85}{11\cdots 64}a^{15}-\frac{78\cdots 79}{23\cdots 28}a^{14}+\frac{38\cdots 81}{27\cdots 68}a^{13}+\frac{18\cdots 33}{47\cdots 56}a^{12}+\frac{36\cdots 07}{23\cdots 28}a^{11}+\frac{91\cdots 99}{23\cdots 28}a^{10}+\frac{23\cdots 67}{47\cdots 56}a^{9}-\frac{99\cdots 89}{47\cdots 56}a^{8}-\frac{12\cdots 07}{47\cdots 56}a^{7}+\frac{46\cdots 47}{47\cdots 56}a^{6}+\frac{68\cdots 35}{29\cdots 66}a^{5}+\frac{30\cdots 65}{11\cdots 64}a^{4}-\frac{42\cdots 01}{90\cdots 28}a^{3}+\frac{12\cdots 89}{10\cdots 68}a^{2}-\frac{42\cdots 61}{18\cdots 56}a+\frac{20\cdots 84}{11\cdots 41}$ 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:  $C_{2}\times C_{4}\times C_{8}$, which has order $64$ (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:  $C_{2}\times C_{4}\times C_{8}$, which has order $64$ (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:  $9$
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:   $\frac{63\cdots 05}{14\cdots 33}a^{19}+\frac{17\cdots 89}{29\cdots 66}a^{18}+\frac{36\cdots 78}{14\cdots 33}a^{17}-\frac{18\cdots 51}{29\cdots 66}a^{16}+\frac{11\cdots 64}{14\cdots 33}a^{15}-\frac{41\cdots 54}{14\cdots 33}a^{14}+\frac{22\cdots 49}{86\cdots 49}a^{13}-\frac{29\cdots 17}{29\cdots 66}a^{12}+\frac{74\cdots 74}{14\cdots 33}a^{11}-\frac{33\cdots 27}{14\cdots 33}a^{10}+\frac{14\cdots 80}{14\cdots 33}a^{9}-\frac{97\cdots 17}{29\cdots 66}a^{8}+\frac{16\cdots 88}{14\cdots 33}a^{7}-\frac{11\cdots 73}{29\cdots 66}a^{6}+\frac{17\cdots 22}{14\cdots 33}a^{5}-\frac{37\cdots 74}{14\cdots 33}a^{4}+\frac{68\cdots 50}{11\cdots 41}a^{3}-\frac{10\cdots 52}{66\cdots 73}a^{2}+\frac{33\cdots 62}{11\cdots 41}a-\frac{28\cdots 13}{11\cdots 41}$, $\frac{22\cdots 71}{29\cdots 66}a^{19}-\frac{53\cdots 49}{29\cdots 66}a^{18}-\frac{66\cdots 63}{14\cdots 33}a^{17}+\frac{84\cdots 26}{14\cdots 33}a^{16}-\frac{39\cdots 07}{29\cdots 66}a^{15}+\frac{50\cdots 09}{14\cdots 33}a^{14}-\frac{61\cdots 53}{14\cdots 33}a^{13}+\frac{19\cdots 80}{14\cdots 33}a^{12}-\frac{21\cdots 21}{29\cdots 66}a^{11}+\frac{45\cdots 05}{14\cdots 33}a^{10}-\frac{20\cdots 04}{14\cdots 33}a^{9}+\frac{61\cdots 76}{14\cdots 33}a^{8}-\frac{21\cdots 06}{14\cdots 33}a^{7}+\frac{14\cdots 71}{29\cdots 66}a^{6}-\frac{19\cdots 14}{14\cdots 33}a^{5}+\frac{42\cdots 78}{14\cdots 33}a^{4}-\frac{74\cdots 38}{11\cdots 41}a^{3}+\frac{19\cdots 86}{11\cdots 41}a^{2}-\frac{36\cdots 80}{11\cdots 41}a+\frac{44\cdots 87}{11\cdots 41}$, $\frac{29\cdots 69}{38\cdots 72}a^{19}+\frac{25\cdots 49}{77\cdots 44}a^{18}-\frac{19\cdots 77}{19\cdots 36}a^{17}+\frac{13\cdots 99}{77\cdots 44}a^{16}-\frac{23\cdots 45}{19\cdots 36}a^{15}+\frac{16\cdots 91}{19\cdots 36}a^{14}-\frac{18\cdots 11}{38\cdots 72}a^{13}+\frac{23\cdots 63}{77\cdots 44}a^{12}-\frac{78\cdots 19}{48\cdots 34}a^{11}+\frac{29\cdots 85}{38\cdots 72}a^{10}-\frac{32\cdots 73}{96\cdots 68}a^{9}+\frac{11\cdots 23}{77\cdots 44}a^{8}-\frac{14\cdots 19}{24\cdots 17}a^{7}+\frac{14\cdots 87}{77\cdots 44}a^{6}-\frac{12\cdots 99}{19\cdots 36}a^{5}+\frac{39\cdots 19}{19\cdots 36}a^{4}-\frac{82\cdots 39}{14\cdots 72}a^{3}+\frac{20\cdots 44}{18\cdots 09}a^{2}-\frac{42\cdots 01}{29\cdots 44}a+\frac{18\cdots 31}{18\cdots 09}$, $\frac{34\cdots 23}{11\cdots 64}a^{19}+\frac{26\cdots 01}{47\cdots 56}a^{18}-\frac{64\cdots 83}{47\cdots 56}a^{17}+\frac{47\cdots 05}{47\cdots 56}a^{16}-\frac{13\cdots 17}{23\cdots 28}a^{15}+\frac{17\cdots 13}{47\cdots 56}a^{14}-\frac{10\cdots 51}{47\cdots 56}a^{13}+\frac{58\cdots 01}{47\cdots 56}a^{12}-\frac{11\cdots 63}{23\cdots 28}a^{11}+\frac{11\cdots 27}{47\cdots 56}a^{10}-\frac{49\cdots 79}{47\cdots 56}a^{9}+\frac{18\cdots 75}{47\cdots 56}a^{8}-\frac{30\cdots 77}{23\cdots 28}a^{7}+\frac{10\cdots 69}{23\cdots 28}a^{6}-\frac{16\cdots 69}{11\cdots 64}a^{5}+\frac{73\cdots 39}{23\cdots 28}a^{4}-\frac{13\cdots 37}{18\cdots 56}a^{3}+\frac{75\cdots 99}{45\cdots 64}a^{2}-\frac{80\cdots 91}{26\cdots 92}a+\frac{18\cdots 95}{45\cdots 64}$, $\frac{54\cdots 93}{47\cdots 56}a^{19}+\frac{18\cdots 65}{27\cdots 68}a^{18}-\frac{34\cdots 89}{58\cdots 32}a^{17}+\frac{14\cdots 37}{47\cdots 56}a^{16}-\frac{26\cdots 39}{11\cdots 64}a^{15}+\frac{53\cdots 21}{47\cdots 56}a^{14}-\frac{92\cdots 51}{11\cdots 64}a^{13}+\frac{18\cdots 93}{47\cdots 56}a^{12}-\frac{39\cdots 37}{23\cdots 28}a^{11}+\frac{37\cdots 57}{47\cdots 56}a^{10}-\frac{20\cdots 63}{58\cdots 32}a^{9}+\frac{57\cdots 81}{47\cdots 56}a^{8}-\frac{11\cdots 59}{27\cdots 68}a^{7}+\frac{16\cdots 43}{11\cdots 64}a^{6}-\frac{25\cdots 39}{58\cdots 32}a^{5}+\frac{22\cdots 29}{23\cdots 28}a^{4}-\frac{37\cdots 61}{18\cdots 56}a^{3}+\frac{98\cdots 47}{18\cdots 56}a^{2}-\frac{90\cdots 33}{90\cdots 28}a+\frac{80\cdots 92}{11\cdots 41}$, $\frac{50\cdots 05}{47\cdots 56}a^{19}-\frac{15\cdots 51}{47\cdots 56}a^{18}+\frac{17\cdots 21}{47\cdots 56}a^{17}-\frac{70\cdots 18}{14\cdots 33}a^{16}+\frac{81\cdots 55}{47\cdots 56}a^{15}-\frac{69\cdots 25}{47\cdots 56}a^{14}+\frac{36\cdots 01}{47\cdots 56}a^{13}-\frac{53\cdots 93}{11\cdots 64}a^{12}+\frac{81\cdots 09}{47\cdots 56}a^{11}-\frac{41\cdots 29}{47\cdots 56}a^{10}+\frac{19\cdots 19}{47\cdots 56}a^{9}-\frac{19\cdots 90}{14\cdots 33}a^{8}+\frac{52\cdots 13}{11\cdots 64}a^{7}-\frac{39\cdots 89}{23\cdots 28}a^{6}+\frac{10\cdots 93}{23\cdots 28}a^{5}-\frac{24\cdots 47}{23\cdots 28}a^{4}+\frac{11\cdots 85}{45\cdots 64}a^{3}-\frac{54\cdots 83}{90\cdots 28}a^{2}+\frac{99\cdots 23}{90\cdots 28}a-\frac{26\cdots 23}{22\cdots 82}$, $\frac{15\cdots 79}{11\cdots 64}a^{19}+\frac{58\cdots 89}{11\cdots 64}a^{18}-\frac{23\cdots 69}{47\cdots 56}a^{17}+\frac{10\cdots 65}{47\cdots 56}a^{16}-\frac{67\cdots 55}{47\cdots 56}a^{15}+\frac{19\cdots 17}{58\cdots 32}a^{14}-\frac{12\cdots 61}{47\cdots 56}a^{13}+\frac{41\cdots 33}{47\cdots 56}a^{12}+\frac{33\cdots 21}{47\cdots 56}a^{11}-\frac{19\cdots 25}{11\cdots 64}a^{10}+\frac{39\cdots 45}{47\cdots 56}a^{9}-\frac{26\cdots 83}{47\cdots 56}a^{8}+\frac{15\cdots 59}{47\cdots 56}a^{7}-\frac{14\cdots 67}{11\cdots 64}a^{6}+\frac{81\cdots 99}{23\cdots 28}a^{5}-\frac{11\cdots 93}{11\cdots 64}a^{4}+\frac{48\cdots 41}{18\cdots 56}a^{3}-\frac{11\cdots 05}{18\cdots 56}a^{2}+\frac{88\cdots 13}{90\cdots 28}a-\frac{18\cdots 95}{22\cdots 82}$, $\frac{56\cdots 75}{47\cdots 56}a^{19}+\frac{26\cdots 13}{47\cdots 56}a^{18}-\frac{20\cdots 51}{47\cdots 56}a^{17}+\frac{47\cdots 39}{11\cdots 64}a^{16}-\frac{57\cdots 13}{47\cdots 56}a^{15}+\frac{56\cdots 55}{47\cdots 56}a^{14}-\frac{25\cdots 35}{36\cdots 12}a^{13}+\frac{17\cdots 85}{58\cdots 32}a^{12}-\frac{65\cdots 67}{47\cdots 56}a^{11}+\frac{33\cdots 63}{47\cdots 56}a^{10}-\frac{13\cdots 45}{47\cdots 56}a^{9}+\frac{10\cdots 33}{11\cdots 64}a^{8}-\frac{19\cdots 79}{58\cdots 32}a^{7}+\frac{26\cdots 61}{23\cdots 28}a^{6}-\frac{41\cdots 03}{13\cdots 12}a^{5}+\frac{16\cdots 77}{23\cdots 28}a^{4}-\frac{75\cdots 41}{45\cdots 64}a^{3}+\frac{26\cdots 75}{69\cdots 56}a^{2}-\frac{57\cdots 43}{90\cdots 28}a+\frac{13\cdots 49}{22\cdots 82}$, $\frac{12\cdots 77}{47\cdots 56}a^{19}-\frac{11\cdots 49}{27\cdots 68}a^{18}+\frac{24\cdots 87}{23\cdots 28}a^{17}-\frac{58\cdots 47}{47\cdots 56}a^{16}+\frac{94\cdots 87}{11\cdots 64}a^{15}-\frac{34\cdots 01}{47\cdots 56}a^{14}+\frac{20\cdots 31}{58\cdots 32}a^{13}-\frac{81\cdots 95}{47\cdots 56}a^{12}+\frac{22\cdots 55}{23\cdots 28}a^{11}-\frac{21\cdots 25}{47\cdots 56}a^{10}+\frac{20\cdots 29}{11\cdots 64}a^{9}-\frac{28\cdots 23}{47\cdots 56}a^{8}+\frac{64\cdots 33}{27\cdots 68}a^{7}-\frac{88\cdots 11}{11\cdots 64}a^{6}+\frac{45\cdots 01}{23\cdots 28}a^{5}-\frac{10\cdots 73}{23\cdots 28}a^{4}+\frac{15\cdots 79}{13\cdots 12}a^{3}-\frac{44\cdots 23}{18\cdots 56}a^{2}+\frac{33\cdots 11}{90\cdots 28}a-\frac{28\cdots 13}{90\cdots 28}$ 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:  \( 152693517470566.22 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 152693517470566.22 \cdot 64}{2\cdot\sqrt{393644681588957236910214274346592274945338834944}}\cr\approx \mathstrut & 0.746821938963927 \end{aligned}\] (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 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012) 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 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012, 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 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012); 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 - x^19 + 55*x^18 - 278*x^17 + 2263*x^16 - 11313*x^15 + 79085*x^14 - 392560*x^13 + 1827617*x^12 - 8550529*x^11 + 37812683*x^10 - 141163000*x^9 + 484077264*x^8 - 1681413400*x^7 + 5243487620*x^6 - 13458733172*x^5 + 31389769344*x^4 - 73483265336*x^3 + 152848977996*x^2 - 230279722452*x + 197469154012); 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

\(\Q(\sqrt{77}) \), \(\Q(\sqrt{-154 +10 \sqrt{77}})\), 5.1.35152.1, 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 $20$ ${\href{/padicField/5.4.0.1}{4} }^{4}{,}\,{\href{/padicField/5.2.0.1}{2} }^{2}$ R R R ${\href{/padicField/17.2.0.1}{2} }^{10}$ ${\href{/padicField/19.4.0.1}{4} }^{4}{,}\,{\href{/padicField/19.2.0.1}{2} }{,}\,{\href{/padicField/19.1.0.1}{1} }^{2}$ ${\href{/padicField/23.2.0.1}{2} }^{10}$ $20$ ${\href{/padicField/31.4.0.1}{4} }^{4}{,}\,{\href{/padicField/31.2.0.1}{2} }^{2}$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }{,}\,{\href{/padicField/37.1.0.1}{1} }^{2}$ ${\href{/padicField/41.4.0.1}{4} }^{4}{,}\,{\href{/padicField/41.2.0.1}{2} }{,}\,{\href{/padicField/41.1.0.1}{1} }^{2}$ ${\href{/padicField/43.4.0.1}{4} }^{5}$ ${\href{/padicField/47.4.0.1}{4} }^{4}{,}\,{\href{/padicField/47.2.0.1}{2} }^{2}$ ${\href{/padicField/53.5.0.1}{5} }^{4}$ ${\href{/padicField/59.4.0.1}{4} }^{4}{,}\,{\href{/padicField/59.2.0.1}{2} }^{2}$

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 2.10.8.1$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$$$[\ ]_{5}^{4}$$
\(7\) Copy content Toggle raw display 7.4.3.2$x^{4} + 21$$4$$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$$$[\ ]_{4}^{4}$$
\(11\) Copy content Toggle raw display 11.4.3.1$x^{4} + 11$$4$$1$$3$$D_{4}$$$[\ ]_{4}^{2}$$
11.16.12.1$x^{16} + 32 x^{14} + 40 x^{13} + 392 x^{12} + 960 x^{11} + 2840 x^{10} + 7920 x^{9} + 15256 x^{8} + 28320 x^{7} + 45280 x^{6} + 47840 x^{5} + 30768 x^{4} + 11840 x^{3} + 2656 x^{2} + 320 x + 27$$4$$4$$12$$C_4:C_4$$$[\ ]_{4}^{4}$$
\(13\) Copy content Toggle raw display $\Q_{13}$$x + 11$$1$$1$$0$Trivial$$[\ ]$$
$\Q_{13}$$x + 11$$1$$1$$0$Trivial$$[\ ]$$
13.2.1.1$x^{2} + 13$$2$$1$$1$$C_2$$$[\ ]_{2}$$
13.4.3.2$x^{4} + 13$$4$$1$$3$$C_4$$$[\ ]_{4}$$
13.4.3.2$x^{4} + 13$$4$$1$$3$$C_4$$$[\ ]_{4}$$
13.4.3.2$x^{4} + 13$$4$$1$$3$$C_4$$$[\ ]_{4}$$
13.4.3.2$x^{4} + 13$$4$$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)