Properties

Label 20.0.106...000.2
Degree $20$
Signature $(0, 10)$
Discriminant $1.064\times 10^{40}$
Root discriminant \(100.31\)
Ramified primes $2,3,5,7$
Class number $32800$ (GRH)
Class group [2, 2, 10, 820] (GRH)
Galois group $C_{20}:C_4$ (as 20T18)

Related objects

Downloads

Learn more

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 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234)
 
Copy content gp:K = bnfinit(y^20 - 10*y^19 + 60*y^18 - 255*y^17 + 1100*y^16 - 4272*y^15 + 12470*y^14 - 28900*y^13 + 38820*y^12 + 88030*y^11 - 928048*y^10 + 2547660*y^9 - 2979955*y^8 + 3898470*y^7 + 27800820*y^6 - 113056091*y^5 - 5438420*y^4 + 153976080*y^3 + 139869420*y^2 + 45065640*y + 14016234, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234)
 

\( x^{20} - 10 x^{19} + 60 x^{18} - 255 x^{17} + 1100 x^{16} - 4272 x^{15} + 12470 x^{14} - 28900 x^{13} + \cdots + 14016234 \) 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:   \(10644112278586200359531250000000000000000\) \(\medspace = 2^{16}\cdot 3^{15}\cdot 5^{22}\cdot 7^{15}\) 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:  \(100.31\)
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:   \(2\), \(3\), \(5\), \(7\) 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:  \(\Q(\sqrt{21}) \)
$\Aut(K/\Q)$:   $C_2$
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 \(a\))

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $\frac{1}{5}a^{10}-\frac{1}{5}a^{5}-\frac{2}{5}$, $\frac{1}{5}a^{11}-\frac{1}{5}a^{6}-\frac{2}{5}a$, $\frac{1}{35}a^{12}-\frac{1}{35}a^{11}-\frac{2}{35}a^{10}+\frac{2}{7}a^{9}+\frac{3}{7}a^{8}+\frac{2}{5}a^{7}+\frac{1}{35}a^{6}-\frac{3}{35}a^{5}-\frac{2}{7}a^{4}+\frac{1}{7}a^{3}-\frac{17}{35}a^{2}+\frac{12}{35}a+\frac{4}{35}$, $\frac{1}{35}a^{13}-\frac{3}{35}a^{11}+\frac{1}{35}a^{10}-\frac{2}{7}a^{9}-\frac{6}{35}a^{8}+\frac{3}{7}a^{7}-\frac{2}{35}a^{6}-\frac{6}{35}a^{5}-\frac{1}{7}a^{4}-\frac{12}{35}a^{3}-\frac{1}{7}a^{2}+\frac{16}{35}a-\frac{17}{35}$, $\frac{1}{35}a^{14}-\frac{2}{35}a^{11}-\frac{2}{35}a^{10}-\frac{11}{35}a^{9}-\frac{2}{7}a^{8}+\frac{1}{7}a^{7}-\frac{3}{35}a^{6}+\frac{1}{5}a^{5}-\frac{1}{5}a^{4}+\frac{2}{7}a^{3}-\frac{16}{35}a-\frac{16}{35}$, $\frac{1}{35}a^{15}+\frac{3}{35}a^{11}-\frac{1}{35}a^{10}+\frac{2}{7}a^{9}-\frac{2}{7}a^{7}+\frac{2}{35}a^{6}+\frac{8}{35}a^{5}-\frac{2}{7}a^{4}+\frac{2}{7}a^{3}-\frac{3}{7}a^{2}-\frac{6}{35}a+\frac{3}{7}$, $\frac{1}{175}a^{16}+\frac{2}{175}a^{15}+\frac{2}{175}a^{14}+\frac{1}{175}a^{13}+\frac{1}{175}a^{12}+\frac{1}{25}a^{11}-\frac{1}{35}a^{10}+\frac{3}{175}a^{9}+\frac{4}{175}a^{8}-\frac{3}{25}a^{7}+\frac{6}{35}a^{6}-\frac{71}{175}a^{5}-\frac{44}{175}a^{4}-\frac{67}{175}a^{3}+\frac{9}{25}a^{2}-\frac{51}{175}a+\frac{1}{175}$, $\frac{1}{175}a^{17}-\frac{2}{175}a^{15}+\frac{2}{175}a^{14}-\frac{1}{175}a^{13}+\frac{11}{175}a^{11}+\frac{13}{175}a^{10}+\frac{68}{175}a^{9}+\frac{3}{25}a^{8}+\frac{27}{175}a^{7}-\frac{11}{175}a^{6}-\frac{27}{175}a^{5}+\frac{36}{175}a^{4}+\frac{47}{175}a^{3}+\frac{83}{175}a^{2}+\frac{68}{175}a+\frac{73}{175}$, $\frac{1}{18\cdots 25}a^{18}+\frac{28\cdots 41}{18\cdots 25}a^{17}+\frac{97\cdots 24}{18\cdots 25}a^{16}-\frac{23\cdots 88}{18\cdots 25}a^{15}-\frac{90\cdots 07}{18\cdots 25}a^{14}+\frac{54\cdots 02}{54\cdots 35}a^{13}+\frac{31\cdots 76}{27\cdots 75}a^{12}+\frac{50\cdots 86}{18\cdots 25}a^{11}+\frac{70\cdots 86}{18\cdots 25}a^{10}-\frac{55\cdots 98}{18\cdots 25}a^{9}+\frac{47\cdots 57}{18\cdots 25}a^{8}+\frac{39\cdots 46}{37\cdots 45}a^{7}+\frac{94\cdots 66}{27\cdots 75}a^{6}-\frac{21\cdots 36}{27\cdots 75}a^{5}-\frac{53\cdots 16}{18\cdots 25}a^{4}+\frac{72\cdots 98}{18\cdots 25}a^{3}+\frac{86\cdots 19}{18\cdots 25}a^{2}-\frac{18\cdots 89}{37\cdots 45}a+\frac{10\cdots 59}{18\cdots 25}$, $\frac{1}{29\cdots 25}a^{19}+\frac{63\cdots 06}{29\cdots 25}a^{18}+\frac{29\cdots 39}{29\cdots 25}a^{17}-\frac{76\cdots 66}{29\cdots 25}a^{16}+\frac{38\cdots 97}{29\cdots 25}a^{15}-\frac{57\cdots 48}{42\cdots 75}a^{14}+\frac{58\cdots 62}{42\cdots 75}a^{13}-\frac{25\cdots 67}{29\cdots 25}a^{12}-\frac{43\cdots 37}{59\cdots 05}a^{11}+\frac{10\cdots 87}{29\cdots 25}a^{10}+\frac{45\cdots 73}{29\cdots 25}a^{9}+\frac{82\cdots 68}{29\cdots 25}a^{8}-\frac{28\cdots 77}{85\cdots 15}a^{7}-\frac{96\cdots 56}{42\cdots 75}a^{6}-\frac{10\cdots 78}{29\cdots 25}a^{5}-\frac{35\cdots 74}{59\cdots 05}a^{4}+\frac{22\cdots 26}{59\cdots 05}a^{3}-\frac{14\cdots 14}{29\cdots 25}a^{2}-\frac{71\cdots 63}{29\cdots 25}a-\frac{24\cdots 37}{60\cdots 25}$ Copy content Toggle raw display

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

Monogenic:  Not computed
Index:  $1$
Inessential primes:  None

Class group and class number

Ideal class group:  $C_{2}\times C_{2}\times C_{10}\times C_{820}$, which has order $32800$ (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:  $C_{2}\times C_{2}\times C_{10}\times C_{820}$, which has order $32800$ (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:   $\frac{10\cdots 52}{85\cdots 15}a^{19}+\frac{10\cdots 94}{85\cdots 15}a^{18}-\frac{63\cdots 04}{85\cdots 15}a^{17}+\frac{27\cdots 07}{85\cdots 15}a^{16}-\frac{11\cdots 88}{85\cdots 15}a^{15}+\frac{46\cdots 48}{85\cdots 15}a^{14}-\frac{19\cdots 84}{12\cdots 45}a^{13}+\frac{32\cdots 74}{85\cdots 15}a^{12}-\frac{69\cdots 68}{12\cdots 45}a^{11}-\frac{72\cdots 32}{85\cdots 15}a^{10}+\frac{94\cdots 48}{85\cdots 15}a^{9}-\frac{27\cdots 24}{85\cdots 15}a^{8}+\frac{37\cdots 28}{85\cdots 15}a^{7}-\frac{14\cdots 50}{24\cdots 09}a^{6}-\frac{39\cdots 52}{12\cdots 45}a^{5}+\frac{11\cdots 68}{85\cdots 15}a^{4}-\frac{28\cdots 56}{12\cdots 45}a^{3}-\frac{31\cdots 92}{24\cdots 09}a^{2}-\frac{31\cdots 17}{85\cdots 15}a+\frac{33\cdots 55}{17\cdots 63}$, $\frac{52\cdots 28}{59\cdots 05}a^{19}-\frac{28\cdots 77}{29\cdots 25}a^{18}+\frac{69\cdots 75}{11\cdots 41}a^{17}-\frac{76\cdots 78}{29\cdots 25}a^{16}+\frac{32\cdots 82}{29\cdots 25}a^{15}-\frac{18\cdots 61}{42\cdots 75}a^{14}+\frac{79\cdots 87}{60\cdots 25}a^{13}-\frac{93\cdots 74}{29\cdots 25}a^{12}+\frac{55\cdots 01}{11\cdots 41}a^{11}+\frac{19\cdots 29}{29\cdots 25}a^{10}-\frac{26\cdots 68}{29\cdots 25}a^{9}+\frac{82\cdots 48}{29\cdots 25}a^{8}-\frac{23\cdots 39}{60\cdots 25}a^{7}+\frac{19\cdots 17}{42\cdots 75}a^{6}+\frac{14\cdots 54}{59\cdots 05}a^{5}-\frac{35\cdots 11}{29\cdots 25}a^{4}+\frac{16\cdots 38}{29\cdots 25}a^{3}+\frac{45\cdots 63}{29\cdots 25}a^{2}+\frac{12\cdots 86}{29\cdots 25}a-\frac{16\cdots 31}{42\cdots 75}$, $\frac{55\cdots 22}{59\cdots 05}a^{19}-\frac{54\cdots 96}{59\cdots 05}a^{18}+\frac{16\cdots 94}{29\cdots 25}a^{17}-\frac{72\cdots 84}{29\cdots 25}a^{16}+\frac{31\cdots 64}{29\cdots 25}a^{15}-\frac{24\cdots 58}{59\cdots 05}a^{14}+\frac{53\cdots 26}{42\cdots 75}a^{13}-\frac{88\cdots 89}{29\cdots 25}a^{12}+\frac{13\cdots 36}{29\cdots 25}a^{11}+\frac{19\cdots 37}{29\cdots 25}a^{10}-\frac{50\cdots 56}{59\cdots 05}a^{9}+\frac{73\cdots 18}{29\cdots 25}a^{8}-\frac{10\cdots 68}{29\cdots 25}a^{7}+\frac{18\cdots 08}{42\cdots 75}a^{6}+\frac{72\cdots 21}{29\cdots 25}a^{5}-\frac{60\cdots 19}{59\cdots 05}a^{4}+\frac{12\cdots 11}{29\cdots 25}a^{3}+\frac{74\cdots 49}{59\cdots 05}a^{2}+\frac{10\cdots 96}{29\cdots 25}a-\frac{85\cdots 77}{29\cdots 25}$, $\frac{31\cdots 04}{85\cdots 15}a^{19}-\frac{33\cdots 76}{85\cdots 15}a^{18}+\frac{41\cdots 08}{17\cdots 63}a^{17}-\frac{91\cdots 66}{85\cdots 15}a^{16}+\frac{78\cdots 32}{17\cdots 63}a^{15}-\frac{15\cdots 56}{85\cdots 15}a^{14}+\frac{67\cdots 24}{12\cdots 45}a^{13}-\frac{11\cdots 82}{85\cdots 15}a^{12}+\frac{18\cdots 36}{85\cdots 15}a^{11}+\frac{25\cdots 92}{12\cdots 45}a^{10}-\frac{29\cdots 46}{85\cdots 15}a^{9}+\frac{19\cdots 79}{17\cdots 63}a^{8}-\frac{13\cdots 48}{85\cdots 15}a^{7}+\frac{27\cdots 86}{12\cdots 45}a^{6}+\frac{10\cdots 98}{12\cdots 45}a^{5}-\frac{39\cdots 36}{85\cdots 15}a^{4}+\frac{15\cdots 86}{85\cdots 15}a^{3}+\frac{47\cdots 59}{85\cdots 15}a^{2}+\frac{27\cdots 86}{17\cdots 63}a+\frac{11\cdots 57}{85\cdots 15}$, $\frac{29\cdots 72}{59\cdots 05}a^{19}-\frac{14\cdots 73}{29\cdots 25}a^{18}+\frac{18\cdots 67}{59\cdots 05}a^{17}-\frac{39\cdots 67}{29\cdots 25}a^{16}+\frac{17\cdots 58}{29\cdots 25}a^{15}-\frac{96\cdots 89}{42\cdots 75}a^{14}+\frac{41\cdots 13}{60\cdots 25}a^{13}-\frac{48\cdots 41}{29\cdots 25}a^{12}+\frac{14\cdots 07}{59\cdots 05}a^{11}+\frac{10\cdots 81}{29\cdots 25}a^{10}-\frac{13\cdots 57}{29\cdots 25}a^{9}+\frac{41\cdots 02}{29\cdots 25}a^{8}-\frac{83\cdots 47}{42\cdots 75}a^{7}+\frac{10\cdots 58}{42\cdots 75}a^{6}+\frac{15\cdots 20}{11\cdots 41}a^{5}-\frac{17\cdots 14}{29\cdots 25}a^{4}+\frac{62\cdots 87}{29\cdots 25}a^{3}+\frac{20\cdots 97}{29\cdots 25}a^{2}+\frac{59\cdots 34}{29\cdots 25}a+\frac{50\cdots 31}{42\cdots 75}$, $\frac{15\cdots 04}{85\cdots 15}a^{19}+\frac{16\cdots 34}{85\cdots 15}a^{18}-\frac{10\cdots 78}{85\cdots 15}a^{17}+\frac{92\cdots 17}{17\cdots 63}a^{16}-\frac{19\cdots 28}{85\cdots 15}a^{15}+\frac{77\cdots 26}{85\cdots 15}a^{14}-\frac{67\cdots 24}{24\cdots 09}a^{13}+\frac{11\cdots 73}{17\cdots 63}a^{12}-\frac{86\cdots 36}{85\cdots 15}a^{11}-\frac{21\cdots 46}{17\cdots 63}a^{10}+\frac{15\cdots 11}{85\cdots 15}a^{9}-\frac{70\cdots 56}{12\cdots 45}a^{8}+\frac{99\cdots 72}{12\cdots 45}a^{7}-\frac{12\cdots 17}{12\cdots 45}a^{6}-\frac{59\cdots 38}{12\cdots 45}a^{5}+\frac{20\cdots 11}{85\cdots 15}a^{4}-\frac{90\cdots 43}{85\cdots 15}a^{3}-\frac{26\cdots 34}{85\cdots 15}a^{2}-\frac{75\cdots 38}{85\cdots 15}a+\frac{55\cdots 61}{85\cdots 15}$, $\frac{14\cdots 28}{59\cdots 05}a^{19}-\frac{31\cdots 17}{11\cdots 41}a^{18}+\frac{69\cdots 93}{42\cdots 75}a^{17}-\frac{21\cdots 11}{29\cdots 25}a^{16}+\frac{92\cdots 76}{29\cdots 25}a^{15}-\frac{72\cdots 62}{59\cdots 05}a^{14}+\frac{15\cdots 84}{42\cdots 75}a^{13}-\frac{26\cdots 56}{29\cdots 25}a^{12}+\frac{39\cdots 84}{29\cdots 25}a^{11}+\frac{10\cdots 87}{60\cdots 25}a^{10}-\frac{14\cdots 99}{59\cdots 05}a^{9}+\frac{22\cdots 02}{29\cdots 25}a^{8}-\frac{32\cdots 22}{29\cdots 25}a^{7}+\frac{57\cdots 87}{42\cdots 75}a^{6}+\frac{19\cdots 09}{29\cdots 25}a^{5}-\frac{19\cdots 51}{59\cdots 05}a^{4}+\frac{82\cdots 41}{60\cdots 25}a^{3}+\frac{23\cdots 96}{59\cdots 05}a^{2}+\frac{34\cdots 79}{29\cdots 25}a-\frac{12\cdots 53}{29\cdots 25}$, $\frac{39\cdots 64}{17\cdots 63}a^{19}-\frac{69\cdots 83}{29\cdots 25}a^{18}+\frac{43\cdots 39}{29\cdots 25}a^{17}-\frac{18\cdots 31}{29\cdots 25}a^{16}+\frac{81\cdots 62}{29\cdots 25}a^{15}-\frac{31\cdots 83}{29\cdots 25}a^{14}+\frac{13\cdots 87}{42\cdots 75}a^{13}-\frac{64\cdots 98}{85\cdots 15}a^{12}+\frac{33\cdots 21}{29\cdots 25}a^{11}+\frac{49\cdots 28}{29\cdots 25}a^{10}-\frac{64\cdots 07}{29\cdots 25}a^{9}+\frac{38\cdots 34}{59\cdots 05}a^{8}-\frac{27\cdots 27}{29\cdots 25}a^{7}+\frac{47\cdots 11}{42\cdots 75}a^{6}+\frac{26\cdots 38}{42\cdots 75}a^{5}-\frac{79\cdots 54}{29\cdots 25}a^{4}+\frac{32\cdots 03}{29\cdots 25}a^{3}+\frac{98\cdots 97}{29\cdots 25}a^{2}+\frac{56\cdots 83}{59\cdots 05}a-\frac{14\cdots 07}{59\cdots 05}$, $\frac{14\cdots 24}{59\cdots 05}a^{19}-\frac{77\cdots 31}{29\cdots 25}a^{18}+\frac{47\cdots 27}{29\cdots 25}a^{17}-\frac{20\cdots 06}{29\cdots 25}a^{16}+\frac{90\cdots 28}{29\cdots 25}a^{15}-\frac{50\cdots 78}{42\cdots 75}a^{14}+\frac{61\cdots 26}{17\cdots 63}a^{13}-\frac{25\cdots 04}{29\cdots 25}a^{12}+\frac{39\cdots 68}{29\cdots 25}a^{11}+\frac{49\cdots 28}{29\cdots 25}a^{10}-\frac{71\cdots 84}{29\cdots 25}a^{9}+\frac{22\cdots 13}{29\cdots 25}a^{8}-\frac{45\cdots 26}{42\cdots 75}a^{7}+\frac{32\cdots 85}{24\cdots 09}a^{6}+\frac{18\cdots 73}{29\cdots 25}a^{5}-\frac{93\cdots 68}{29\cdots 25}a^{4}+\frac{37\cdots 62}{29\cdots 25}a^{3}+\frac{11\cdots 89}{29\cdots 25}a^{2}+\frac{32\cdots 66}{29\cdots 25}a+\frac{21\cdots 29}{42\cdots 75}$ 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:  \( 179235004.46434572 \) (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

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{10}\cdot 179235004.46434572 \cdot 32800}{2\cdot\sqrt{10644112278586200359531250000000000000000}}\cr\approx \mathstrut & 2.73218837477612 \end{aligned}\] (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 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234) 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 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234, 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 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234); 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 - 10*x^19 + 60*x^18 - 255*x^17 + 1100*x^16 - 4272*x^15 + 12470*x^14 - 28900*x^13 + 38820*x^12 + 88030*x^11 - 928048*x^10 + 2547660*x^9 - 2979955*x^8 + 3898470*x^7 + 27800820*x^6 - 113056091*x^5 - 5438420*x^4 + 153976080*x^3 + 139869420*x^2 + 45065640*x + 14016234); 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

\(\Q(\sqrt{105}) \), \(\Q(\sqrt{-21 +2 \sqrt{105}})\), 5.5.2450000.1, 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: 20.0.2128822455717240071906250000000000000000.2

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 R R $20$ ${\href{/padicField/13.4.0.1}{4} }^{4}{,}\,{\href{/padicField/13.2.0.1}{2} }{,}\,{\href{/padicField/13.1.0.1}{1} }^{2}$ ${\href{/padicField/17.4.0.1}{4} }^{4}{,}\,{\href{/padicField/17.2.0.1}{2} }^{2}$ $20$ ${\href{/padicField/23.4.0.1}{4} }^{4}{,}\,{\href{/padicField/23.2.0.1}{2} }{,}\,{\href{/padicField/23.1.0.1}{1} }^{2}$ ${\href{/padicField/29.4.0.1}{4} }^{5}$ ${\href{/padicField/31.4.0.1}{4} }^{5}$ ${\href{/padicField/37.4.0.1}{4} }^{4}{,}\,{\href{/padicField/37.2.0.1}{2} }^{2}$ ${\href{/padicField/41.2.0.1}{2} }^{8}{,}\,{\href{/padicField/41.1.0.1}{1} }^{4}$ ${\href{/padicField/43.4.0.1}{4} }^{4}{,}\,{\href{/padicField/43.2.0.1}{2} }^{2}$ ${\href{/padicField/47.4.0.1}{4} }^{4}{,}\,{\href{/padicField/47.2.0.1}{2} }^{2}$ ${\href{/padicField/53.4.0.1}{4} }^{4}{,}\,{\href{/padicField/53.2.0.1}{2} }{,}\,{\href{/padicField/53.1.0.1}{1} }^{2}$ ${\href{/padicField/59.5.0.1}{5} }^{4}$

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
\(2\) Copy content Toggle raw display 2.5.4.1$x^{5} + 2$$5$$1$$4$$F_5$$$[\ ]_{5}^{4}$$
2.5.4.1$x^{5} + 2$$5$$1$$4$$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$$$[\ ]_{5}^{4}$$
\(3\) 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$$$[\ ]_{4}^{4}$$
\(5\) Copy content Toggle raw display 5.10.11.1$x^{10} + 20 x^{2} + 5$$10$$1$$11$$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 7.4.3.2$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$$$[\ ]_{4}^{4}$$

Spectrum of ring of integers

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