Degree $2$
Signature $[2, 0]$
Discriminant $44$
Root discriminant \(6.63\)
Ramified primes see page
Class number $1$
Class group trivial
Galois group $C_2$ (as 2T1)

Related objects


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Show commands: SageMath / Pari/GP / Magma

Normalized defining polynomial

sage: x = polygen(QQ); K.<a> = NumberField(x^2 - 11)
gp: K = bnfinit(x^2 - 11, 1)
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-11, 0, 1]);

\( x^{2} - 11 \) Copy content Toggle raw display

sage: K.defining_polynomial()
gp: K.pol
magma: DefiningPolynomial(K);


Degree:  $2$
gp: poldegree(K.pol)
magma: Degree(K);
Signature:  $[2, 0]$
sage: K.signature()
gp: K.sign
magma: Signature(K);
Discriminant:   \(44\) \(\medspace = 2^{2}\cdot 11\) Copy content Toggle raw display
sage: K.disc()
gp: K.disc
magma: Discriminant(Integers(K));
Root discriminant:  \(6.63\)
sage: (K.disc().abs())^(1./
gp: abs(K.disc)^(1/poldegree(K.pol))
magma: Abs(Discriminant(Integers(K)))^(1/Degree(K));
Ramified primes:   \(2\), \(11\) Copy content Toggle raw display
sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(Integers(K)));
$\card{ \Gal(K/\Q) }$:  $2$
This field is Galois and abelian over $\Q$.
Conductor:  \(44=2^{2}\cdot 11\)
Dirichlet character group:    $\lbrace$$\chi_{44}(1,·)$, $\chi_{44}(43,·)$$\rbrace$
This is not a CM field.

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

$1$, $a$ Copy content Toggle raw display

sage: K.integral_basis()
gp: K.zk
magma: IntegralBasis(K);

Monogenic:  Yes
Index:  $1$
Inessential primes:  None

Class group and class number

Trivial group, which has order $1$

sage: K.class_group().invariants()
gp: K.clgp
magma: ClassGroup(K);

Unit group

sage: UK = K.unit_group()
magma: UK, f := UnitGroup(K);
Rank:  $1$
sage: UK.rank()
gp: K.fu
magma: UnitRank(K);
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
sage: UK.torsion_generator()
gp: K.tu[2]
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
Fundamental unit:   $3a+10$ Copy content Toggle raw display
sage: UK.fundamental_units()
gp: K.fu
magma: [K!f(g): g in Generators(UK)];
Regulator:  \( 2.99322284613 \)
sage: K.regulator()
gp: K.reg
magma: Regulator(K);

Class number formula

$\displaystyle\lim_{s\to 1} (s-1)\zeta_K(s) \approx\frac{2^{2}\cdot(2\pi)^{0}\cdot 2.99322284613 \cdot 1}{2\sqrt{44}}\approx 0.902490644958$

Galois group

$C_2$ (as 2T1):

sage: K.galois_group(type='pari')
gp: polgalois(K.pol)
magma: GaloisGroup(K);
A cyclic group of order 2
The 2 conjugacy class representatives for $C_2$
Character table for $C_2$

Intermediate fields

The extension is primitive: there are no intermediate fields between this field and $\Q$.

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R ${\href{/padicField/}{2} }$ ${\href{/padicField/}{1} }^{2}$ ${\href{/padicField/}{1} }^{2}$ R ${\href{/padicField/}{2} }$ ${\href{/padicField/}{2} }$ ${\href{/padicField/}{1} }^{2}$ ${\href{/padicField/}{2} }$ ${\href{/padicField/}{2} }$ ${\href{/padicField/}{2} }$ ${\href{/padicField/}{1} }^{2}$ ${\href{/padicField/}{2} }$ ${\href{/padicField/}{1} }^{2}$ ${\href{/padicField/}{2} }$ ${\href{/padicField/}{1} }^{2}$ ${\href{/padicField/}{2} }$

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

sage: p = 7; # to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
sage: [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
gp: p = 7; \\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
gp: idealfactors = idealprimedec(K, p); \\ get the data
gp: vector(length(idealfactors), j, [idealfactors[j][3], idealfactors[j][4]])
magma: p := 7; // to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
magma: idealfactors := Factorization(p*Integers(K)); // get the data
magma: [<primefactor[2], Valuation(Norm(primefactor[1]), p)> : primefactor in idealfactors];

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(2\) Copy content Toggle raw display$x^{2} + 2 x - 2$$2$$1$$2$$C_2$$[2]$
\(11\) Copy content Toggle raw display$x^{2} - 11$$2$$1$$1$$C_2$$[\ ]_{2}$

Artin representations

Label Dimension Conductor Artin stem field $G$ Ind $\chi(c)$
* 1.1.1t1.a.a$1$ $1$ \(\Q\) $C_1$ $1$ $1$
* 1.44.2t1.a.a$1$ $ 2^{2} \cdot 11 $ \(\Q(\sqrt{11}) \) $C_2$ (as 2T1) $1$ $1$

Data is given for all irreducible representations of the Galois group for the Galois closure of this field. Those marked with * are summands in the permutation representation coming from this field. Representations which appear with multiplicity greater than one are indicated by exponents on the *.