Properties

Label 20.0.779...625.1
Degree $20$
Signature $(0, 10)$
Discriminant $7.799\times 10^{37}$
Root discriminant \(78.45\)
Ramified primes $3,5,7$
Class number $1080$ (GRH)
Class group [2, 2, 270] (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 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760)
 
Copy content gp:K = bnfinit(y^20 + 35*y^18 + 560*y^16 - 119*y^15 + 5075*y^14 - 4515*y^13 + 30625*y^12 - 58170*y^11 + 119035*y^10 - 221725*y^9 + 502985*y^8 + 282975*y^7 + 5120500*y^6 + 5110798*y^5 + 24667825*y^4 + 21049420*y^3 + 44559375*y^2 + 11605160*y + 29901760, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760)
 

\( x^{20} + 35 x^{18} + 560 x^{16} - 119 x^{15} + 5075 x^{14} - 4515 x^{13} + 30625 x^{12} + \cdots + 29901760 \) 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:   \(77992289980729574777937412261962890625\) \(\medspace = 3^{15}\cdot 5^{21}\cdot 7^{19}\) 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:  \(78.45\)
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:   \(3\), \(5\), \(7\) Copy content Toggle raw display
Copy content comment:Ramified primes
 
Copy content sage:K.disc().support()
 
Copy content gp:factor(abs(K.disc))[,1]~
 
Copy content magma:PrimeDivisors(Discriminant(OK));
 
Copy content oscar:prime_divisors(discriminant(OK))
 
Discriminant root field:  \(\Q(\sqrt{105}) \)
$\Aut(K/\Q)$:   $C_2$
Copy content comment:Automorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphism_group(K)
 
This field is not Galois over $\Q$.
This is a CM field.
Reflex fields:  unavailable$^{512}$

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{7}a^{10}$, $\frac{1}{7}a^{11}$, $\frac{1}{14}a^{12}-\frac{1}{14}a^{11}-\frac{1}{2}a^{7}-\frac{1}{2}a^{6}-\frac{1}{2}a^{2}-\frac{1}{2}a$, $\frac{1}{14}a^{13}-\frac{1}{14}a^{11}-\frac{1}{2}a^{8}-\frac{1}{2}a^{6}-\frac{1}{2}a^{3}-\frac{1}{2}a$, $\frac{1}{14}a^{14}-\frac{1}{14}a^{11}-\frac{1}{2}a^{9}-\frac{1}{2}a^{6}-\frac{1}{2}a^{4}-\frac{1}{2}a$, $\frac{1}{140}a^{15}-\frac{1}{28}a^{14}-\frac{1}{28}a^{12}+\frac{1}{28}a^{11}-\frac{3}{140}a^{10}+\frac{1}{4}a^{9}-\frac{1}{2}a^{8}-\frac{1}{4}a^{7}-\frac{1}{4}a^{6}-\frac{9}{20}a^{5}+\frac{1}{4}a^{4}-\frac{1}{4}a^{2}+\frac{1}{4}a$, $\frac{1}{140}a^{16}-\frac{1}{28}a^{14}-\frac{1}{28}a^{13}+\frac{1}{70}a^{11}-\frac{1}{4}a^{9}+\frac{1}{4}a^{8}-\frac{1}{2}a^{7}+\frac{3}{10}a^{6}+\frac{1}{4}a^{4}-\frac{1}{4}a^{3}+\frac{1}{4}a$, $\frac{1}{140}a^{17}-\frac{3}{140}a^{12}-\frac{1}{28}a^{11}-\frac{1}{14}a^{10}+\frac{1}{20}a^{7}+\frac{1}{4}a^{6}-\frac{1}{2}a^{4}-\frac{1}{4}a$, $\frac{1}{786328200}a^{18}+\frac{2250527}{786328200}a^{17}-\frac{1241381}{393164100}a^{16}+\frac{1324927}{393164100}a^{15}-\frac{220}{561663}a^{14}+\frac{1786021}{112332600}a^{13}-\frac{994913}{65527350}a^{12}+\frac{52375901}{786328200}a^{11}+\frac{11684417}{196582050}a^{10}-\frac{94099}{330390}a^{9}+\frac{3235159}{12481400}a^{8}+\frac{702637}{18722100}a^{7}-\frac{26145907}{112332600}a^{6}-\frac{381067}{1651950}a^{5}+\frac{2469889}{11233260}a^{4}-\frac{85259}{660780}a^{3}-\frac{1064303}{4493304}a^{2}+\frac{6631793}{22466520}a+\frac{659347}{2808315}$, $\frac{1}{73\cdots 00}a^{19}+\frac{19\cdots 11}{81\cdots 00}a^{18}-\frac{61\cdots 91}{91\cdots 75}a^{17}-\frac{92\cdots 49}{18\cdots 15}a^{16}-\frac{56\cdots 89}{17\cdots 25}a^{15}-\frac{25\cdots 03}{73\cdots 00}a^{14}-\frac{75\cdots 11}{36\cdots 00}a^{13}+\frac{29\cdots 99}{73\cdots 00}a^{12}+\frac{49\cdots 09}{73\cdots 60}a^{11}-\frac{44\cdots 28}{91\cdots 75}a^{10}+\frac{44\cdots 61}{10\cdots 00}a^{9}-\frac{17\cdots 79}{43\cdots 75}a^{8}-\frac{13\cdots 33}{10\cdots 00}a^{7}+\frac{57\cdots 91}{11\cdots 20}a^{6}+\frac{10\cdots 29}{52\cdots 00}a^{5}+\frac{70\cdots 65}{34\cdots 26}a^{4}+\frac{10\cdots 21}{69\cdots 20}a^{3}-\frac{48\cdots 87}{20\cdots 60}a^{2}-\frac{20\cdots 87}{52\cdots 90}a+\frac{56\cdots 54}{26\cdots 45}$ Copy content Toggle raw display

Copy content comment:Integral basis
 
Copy content sage:K.integral_basis()
 
Copy content gp:K.zk
 
Copy content magma:IntegralBasis(K);
 
Copy content oscar:basis(OK)
 

Monogenic:  No
Index:  Not computed
Inessential primes:  $2$

Class group and class number

Ideal class group:  $C_{2}\times C_{2}\times C_{270}$, which has order $1080$ (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:  $C_{2}\times C_{2}\times C_{270}$, which has order $1080$ (assuming GRH)
Copy content comment:Narrow class group
 
Copy content sage:K.narrow_class_group().invariants()
 
Copy content gp:bnfnarrow(K)
 
Copy content magma:NarrowClassGroup(K);
 
Relative class number:   data not computed (assuming GRH)

Unit group

Copy content comment:Unit group
 
Copy content sage:UK = K.unit_group()
 
Copy content magma:UK, fUK := UnitGroup(K);
 
Copy content oscar:UK, fUK = unit_group(OK)
 
Rank:  $9$
Copy content comment:Unit rank
 
Copy content sage:UK.rank()
 
Copy content gp:K.fu
 
Copy content magma:UnitRank(K);
 
Copy content oscar:rank(UK)
 
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
Copy content comment:Generator for roots of unity
 
Copy content sage:UK.torsion_generator()
 
Copy content gp:K.tu[2]
 
Copy content magma:K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
Copy content oscar:torsion_units_generator(OK)
 
Fundamental units:   $\frac{76\cdots 09}{24\cdots 20}a^{19}+\frac{45\cdots 57}{24\cdots 20}a^{18}+\frac{20\cdots 13}{20\cdots 35}a^{17}-\frac{47\cdots 69}{81\cdots 40}a^{16}+\frac{35\cdots 19}{24\cdots 20}a^{15}-\frac{28\cdots 77}{47\cdots 20}a^{14}+\frac{28\cdots 29}{24\cdots 20}a^{13}-\frac{96\cdots 52}{60\cdots 05}a^{12}+\frac{51\cdots 37}{81\cdots 40}a^{11}-\frac{18\cdots 77}{11\cdots 20}a^{10}+\frac{80\cdots 59}{34\cdots 60}a^{9}-\frac{37\cdots 51}{11\cdots 20}a^{8}+\frac{22\cdots 83}{17\cdots 30}a^{7}+\frac{58\cdots 13}{34\cdots 60}a^{6}+\frac{13\cdots 33}{11\cdots 20}a^{5}+\frac{15\cdots 87}{17\cdots 63}a^{4}+\frac{63\cdots 35}{17\cdots 63}a^{3}+\frac{11\cdots 57}{11\cdots 42}a^{2}+\frac{14\cdots 43}{57\cdots 21}a+\frac{12\cdots 71}{17\cdots 63}$, $\frac{15\cdots 75}{19\cdots 48}a^{19}-\frac{23\cdots 45}{33\cdots 34}a^{18}+\frac{95\cdots 75}{45\cdots 12}a^{17}-\frac{14\cdots 10}{56\cdots 39}a^{16}+\frac{45\cdots 70}{16\cdots 17}a^{15}-\frac{29\cdots 75}{64\cdots 16}a^{14}+\frac{39\cdots 25}{19\cdots 48}a^{13}-\frac{11\cdots 75}{19\cdots 48}a^{12}+\frac{92\cdots 35}{64\cdots 16}a^{11}-\frac{13\cdots 83}{32\cdots 08}a^{10}+\frac{13\cdots 25}{19\cdots 48}a^{9}-\frac{60\cdots 25}{64\cdots 16}a^{8}+\frac{72\cdots 25}{19\cdots 48}a^{7}-\frac{73\cdots 05}{19\cdots 48}a^{6}+\frac{37\cdots 73}{16\cdots 54}a^{5}-\frac{13\cdots 25}{97\cdots 24}a^{4}+\frac{43\cdots 15}{19\cdots 48}a^{3}-\frac{52\cdots 50}{80\cdots 77}a^{2}+\frac{13\cdots 65}{64\cdots 16}a-\frac{90\cdots 28}{24\cdots 31}$, $\frac{23\cdots 43}{48\cdots 40}a^{19}+\frac{57\cdots 53}{24\cdots 20}a^{18}+\frac{12\cdots 37}{46\cdots 68}a^{17}+\frac{31\cdots 69}{40\cdots 70}a^{16}+\frac{30\cdots 19}{60\cdots 05}a^{15}+\frac{14\cdots 57}{16\cdots 80}a^{14}+\frac{20\cdots 47}{48\cdots 40}a^{13}+\frac{14\cdots 17}{57\cdots 84}a^{12}+\frac{22\cdots 77}{16\cdots 80}a^{11}-\frac{34\cdots 63}{11\cdots 20}a^{10}+\frac{68\cdots 43}{69\cdots 20}a^{9}-\frac{27\cdots 53}{23\cdots 40}a^{8}+\frac{46\cdots 39}{13\cdots 04}a^{7}+\frac{12\cdots 63}{69\cdots 20}a^{6}+\frac{15\cdots 28}{28\cdots 05}a^{5}+\frac{78\cdots 49}{69\cdots 52}a^{4}+\frac{34\cdots 29}{13\cdots 04}a^{3}+\frac{51\cdots 49}{23\cdots 84}a^{2}+\frac{75\cdots 13}{46\cdots 68}a+\frac{32\cdots 95}{17\cdots 63}$, $\frac{43\cdots 43}{97\cdots 28}a^{19}+\frac{57\cdots 05}{12\cdots 41}a^{18}+\frac{21\cdots 81}{16\cdots 80}a^{17}+\frac{24\cdots 49}{20\cdots 35}a^{16}+\frac{15\cdots 49}{86\cdots 15}a^{15}+\frac{25\cdots 81}{32\cdots 76}a^{14}+\frac{11\cdots 85}{97\cdots 28}a^{13}-\frac{50\cdots 59}{48\cdots 40}a^{12}+\frac{75\cdots 99}{16\cdots 80}a^{11}-\frac{15\cdots 61}{11\cdots 20}a^{10}+\frac{90\cdots 59}{13\cdots 04}a^{9}-\frac{33\cdots 27}{27\cdots 04}a^{8}+\frac{11\cdots 63}{69\cdots 20}a^{7}+\frac{21\cdots 01}{69\cdots 20}a^{6}+\frac{96\cdots 37}{57\cdots 10}a^{5}+\frac{13\cdots 25}{69\cdots 52}a^{4}+\frac{39\cdots 41}{13\cdots 04}a^{3}+\frac{60\cdots 51}{57\cdots 21}a^{2}+\frac{96\cdots 79}{46\cdots 68}a-\frac{54\cdots 82}{17\cdots 63}$, $\frac{15\cdots 21}{97\cdots 28}a^{19}+\frac{52\cdots 15}{24\cdots 82}a^{18}-\frac{18\cdots 19}{32\cdots 76}a^{17}+\frac{13\cdots 13}{20\cdots 35}a^{16}-\frac{45\cdots 03}{48\cdots 64}a^{15}+\frac{37\cdots 43}{32\cdots 76}a^{14}-\frac{12\cdots 45}{13\cdots 04}a^{13}+\frac{14\cdots 39}{97\cdots 28}a^{12}-\frac{96\cdots 27}{16\cdots 80}a^{11}+\frac{81\cdots 88}{57\cdots 21}a^{10}-\frac{39\cdots 07}{13\cdots 04}a^{9}+\frac{24\cdots 45}{46\cdots 68}a^{8}-\frac{12\cdots 79}{13\cdots 04}a^{7}-\frac{29\cdots 33}{69\cdots 20}a^{6}-\frac{17\cdots 01}{23\cdots 84}a^{5}-\frac{21\cdots 91}{17\cdots 63}a^{4}-\frac{49\cdots 55}{13\cdots 04}a^{3}-\frac{16\cdots 85}{23\cdots 84}a^{2}-\frac{11\cdots 55}{46\cdots 68}a+\frac{41\cdots 18}{17\cdots 63}$, $\frac{52\cdots 69}{12\cdots 10}a^{19}-\frac{36\cdots 79}{97\cdots 28}a^{18}+\frac{24\cdots 77}{16\cdots 80}a^{17}-\frac{11\cdots 33}{81\cdots 40}a^{16}+\frac{29\cdots 93}{12\cdots 10}a^{15}-\frac{32\cdots 39}{11\cdots 20}a^{14}+\frac{30\cdots 97}{13\cdots 04}a^{13}-\frac{97\cdots 59}{24\cdots 20}a^{12}+\frac{24\cdots 33}{16\cdots 80}a^{11}-\frac{42\cdots 43}{11\cdots 20}a^{10}+\frac{27\cdots 93}{34\cdots 60}a^{9}-\frac{63\cdots 99}{46\cdots 68}a^{8}+\frac{57\cdots 59}{17\cdots 30}a^{7}-\frac{61\cdots 93}{69\cdots 20}a^{6}+\frac{24\cdots 97}{11\cdots 20}a^{5}-\frac{13\cdots 09}{34\cdots 26}a^{4}+\frac{57\cdots 65}{69\cdots 52}a^{3}+\frac{35\cdots 05}{46\cdots 68}a^{2}+\frac{26\cdots 05}{46\cdots 68}a+\frac{14\cdots 23}{17\cdots 63}$, $\frac{10\cdots 77}{48\cdots 40}a^{19}+\frac{74\cdots 43}{24\cdots 20}a^{18}+\frac{11\cdots 97}{16\cdots 80}a^{17}+\frac{67\cdots 13}{81\cdots 40}a^{16}+\frac{60\cdots 17}{60\cdots 05}a^{15}+\frac{11\cdots 33}{16\cdots 80}a^{14}+\frac{35\cdots 67}{48\cdots 40}a^{13}-\frac{18\cdots 13}{48\cdots 40}a^{12}+\frac{45\cdots 27}{16\cdots 80}a^{11}-\frac{88\cdots 49}{11\cdots 20}a^{10}+\frac{33\cdots 87}{69\cdots 20}a^{9}-\frac{27\cdots 93}{23\cdots 40}a^{8}+\frac{66\cdots 01}{69\cdots 20}a^{7}+\frac{12\cdots 33}{69\cdots 20}a^{6}+\frac{29\cdots 64}{28\cdots 05}a^{5}+\frac{45\cdots 83}{34\cdots 26}a^{4}+\frac{34\cdots 21}{13\cdots 04}a^{3}+\frac{32\cdots 75}{23\cdots 84}a^{2}+\frac{81\cdots 45}{46\cdots 68}a-\frac{64\cdots 90}{17\cdots 63}$, $\frac{27\cdots 35}{12\cdots 41}a^{19}+\frac{98\cdots 11}{48\cdots 40}a^{18}+\frac{37\cdots 87}{32\cdots 76}a^{17}+\frac{14\cdots 23}{20\cdots 35}a^{16}+\frac{50\cdots 25}{24\cdots 82}a^{15}+\frac{42\cdots 71}{81\cdots 94}a^{14}+\frac{97\cdots 87}{48\cdots 40}a^{13}-\frac{69\cdots 41}{69\cdots 52}a^{12}+\frac{16\cdots 83}{16\cdots 80}a^{11}-\frac{52\cdots 17}{23\cdots 84}a^{10}+\frac{13\cdots 69}{34\cdots 26}a^{9}-\frac{25\cdots 43}{23\cdots 40}a^{8}+\frac{52\cdots 95}{34\cdots 26}a^{7}+\frac{23\cdots 77}{69\cdots 20}a^{6}+\frac{48\cdots 95}{23\cdots 84}a^{5}+\frac{19\cdots 33}{69\cdots 52}a^{4}+\frac{19\cdots 27}{17\cdots 63}a^{3}+\frac{32\cdots 07}{46\cdots 68}a^{2}+\frac{19\cdots 25}{27\cdots 04}a-\frac{32\cdots 69}{17\cdots 63}$, $\frac{12\cdots 57}{97\cdots 28}a^{19}+\frac{75\cdots 41}{28\cdots 20}a^{18}+\frac{37\cdots 81}{81\cdots 40}a^{17}+\frac{30\cdots 41}{40\cdots 70}a^{16}+\frac{17\cdots 89}{24\cdots 20}a^{15}+\frac{21\cdots 09}{32\cdots 76}a^{14}+\frac{67\cdots 31}{12\cdots 10}a^{13}-\frac{12\cdots 69}{69\cdots 20}a^{12}+\frac{16\cdots 79}{81\cdots 40}a^{11}-\frac{70\cdots 77}{11\cdots 20}a^{10}+\frac{54\cdots 83}{13\cdots 04}a^{9}-\frac{19\cdots 03}{11\cdots 20}a^{8}+\frac{27\cdots 53}{40\cdots 60}a^{7}+\frac{55\cdots 81}{34\cdots 60}a^{6}+\frac{43\cdots 29}{57\cdots 10}a^{5}+\frac{74\cdots 91}{69\cdots 52}a^{4}+\frac{35\cdots 87}{13\cdots 04}a^{3}+\frac{77\cdots 79}{46\cdots 68}a^{2}+\frac{19\cdots 29}{11\cdots 42}a-\frac{28\cdots 07}{17\cdots 63}$ 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:  \( 224767289.30957106 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 224767289.30957106 \cdot 1080}{2\cdot\sqrt{77992289980729574777937412261962890625}}\cr\approx \mathstrut & 1.31795236990188 \end{aligned}\] (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 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760) 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 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760, 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 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760); 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 + 35*x^18 + 560*x^16 - 119*x^15 + 5075*x^14 - 4515*x^13 + 30625*x^12 - 58170*x^11 + 119035*x^10 - 221725*x^9 + 502985*x^8 + 282975*x^7 + 5120500*x^6 + 5110798*x^5 + 24667825*x^4 + 21049420*x^3 + 44559375*x^2 + 11605160*x + 29901760); OK = ring_of_integers(K); DK = discriminant(OK); UK, fUK = unit_group(OK); clK, fclK = class_group(OK); r1,r2 = signature(K); RK = regulator(K); RR = parent(RK); hK = order(clK); wK = torsion_units_order(K); 2^r1 * (2*pi)^r2 * RK * hK / (wK * sqrt(RR(abs(DK))))
 

Galois group

$C_{20}:C_4$ (as 20T18):

Copy content comment:Galois group
 
Copy content sage:K.galois_group()
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:G = GaloisGroup(K);
 
Copy content oscar:G, Gtx = galois_group(K); degree(K) > 1 ? (G, transitive_group_identification(G)) : (G, nothing)
 
A solvable group of order 80
The 14 conjugacy class representatives for $C_{20}:C_4$
Character table for $C_{20}:C_4$

Intermediate fields

\(\Q(\sqrt{21}) \), \(\Q(\sqrt{-42 +2 \sqrt{21}})\), 5.5.67528125.1, 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 ${\href{/padicField/2.4.0.1}{4} }^{4}{,}\,{\href{/padicField/2.2.0.1}{2} }^{2}$ R R R ${\href{/padicField/11.4.0.1}{4} }^{5}$ ${\href{/padicField/13.4.0.1}{4} }^{4}{,}\,{\href{/padicField/13.2.0.1}{2} }^{2}$ ${\href{/padicField/17.4.0.1}{4} }^{4}{,}\,{\href{/padicField/17.2.0.1}{2} }{,}\,{\href{/padicField/17.1.0.1}{1} }^{2}$ ${\href{/padicField/19.4.0.1}{4} }^{5}$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }^{2}$ $20$ $20$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }{,}\,{\href{/padicField/37.1.0.1}{1} }^{2}$ ${\href{/padicField/41.2.0.1}{2} }^{8}{,}\,{\href{/padicField/41.1.0.1}{1} }^{4}$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }{,}\,{\href{/padicField/43.1.0.1}{1} }^{2}$ ${\href{/padicField/47.4.0.1}{4} }^{4}{,}\,{\href{/padicField/47.2.0.1}{2} }{,}\,{\href{/padicField/47.1.0.1}{1} }^{2}$ ${\href{/padicField/53.4.0.1}{4} }^{4}{,}\,{\href{/padicField/53.2.0.1}{2} }^{2}$ ${\href{/padicField/59.5.0.1}{5} }^{4}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

Copy content comment:Frobenius cycle types
 
Copy content sage:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Sage: p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
Copy content gp:\\ to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Pari: p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
Copy content magma:// to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Magma: p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
Copy content oscar:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Oscar: p = 7; pfac = factor(ideal(ring_of_integers(K), p)); [(e, valuation(norm(pr),p)) for (pr,e) in pfac]
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(3\) Copy content Toggle raw display 3.4.3.2$x^{4} + 6$$4$$1$$3$$D_{4}$$$[\ ]_{4}^{2}$$
3.16.12.1$x^{16} + 8 x^{15} + 24 x^{14} + 32 x^{13} + 24 x^{12} + 48 x^{11} + 96 x^{10} + 64 x^{9} + 24 x^{8} + 96 x^{7} + 96 x^{6} + 32 x^{4} + 64 x^{3} + 19$$4$$4$$12$$C_4:C_4$$$[\ ]_{4}^{4}$$
\(5\) Copy content Toggle raw display 5.5.5.1$x^{5} + 20 x + 5$$5$$1$$5$$F_5$$$[\frac{5}{4}]_{4}$$
5.5.5.1$x^{5} + 20 x + 5$$5$$1$$5$$F_5$$$[\frac{5}{4}]_{4}$$
5.10.11.1$x^{10} + 20 x^{2} + 5$$10$$1$$11$$F_5$$$[\frac{5}{4}]_{4}$$
\(7\) Copy content Toggle raw display 7.20.19.1$x^{20} + 7$$20$$1$$19$20T18$$[\ ]_{20}^{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)