Normalized defining polynomial
\( x^{16} - 7x^{12} + 40x^{8} - 112x^{4} + 256 \)
Invariants
Degree: | $16$ | sage: K.degree()
gp: poldegree(K.pol)
magma: Degree(K);
oscar: degree(K)
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Signature: | $[0, 8]$ | sage: K.signature()
gp: K.sign
magma: Signature(K);
oscar: signature(K)
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Discriminant: | \(29960650073923649536\) \(\medspace = 2^{32}\cdot 17^{8}\) | sage: K.disc()
gp: K.disc
magma: OK := Integers(K); Discriminant(OK);
oscar: OK = ring_of_integers(K); discriminant(OK)
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Root discriminant: | \(16.49\) | sage: (K.disc().abs())^(1./K.degree())
gp: abs(K.disc)^(1/poldegree(K.pol))
magma: Abs(Discriminant(OK))^(1/Degree(K));
oscar: (1.0 * dK)^(1/degree(K))
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Galois root discriminant: | $2^{2}17^{1/2}\approx 16.492422502470642$ | ||
Ramified primes: | \(2\), \(17\) | sage: K.disc().support()
gp: factor(abs(K.disc))[,1]~
magma: PrimeDivisors(Discriminant(OK));
oscar: prime_divisors(discriminant((OK)))
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Discriminant root field: | \(\Q\) | ||
$\card{ \Gal(K/\Q) }$: | $16$ | sage: K.automorphisms()
magma: Automorphisms(K);
oscar: automorphisms(K)
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This field is Galois over $\Q$. | |||
This is a CM field. | |||
Reflex fields: | unavailable$^{128}$ |
Integral basis (with respect to field generator \(a\))
$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $\frac{1}{2}a^{6}-\frac{1}{2}a^{2}$, $\frac{1}{4}a^{7}-\frac{1}{2}a^{5}+\frac{1}{4}a^{3}-\frac{1}{2}a$, $\frac{1}{8}a^{8}-\frac{1}{4}a^{6}-\frac{1}{2}a^{5}+\frac{1}{8}a^{4}-\frac{1}{4}a^{2}-\frac{1}{2}a$, $\frac{1}{8}a^{9}-\frac{3}{8}a^{5}-\frac{1}{2}a$, $\frac{1}{16}a^{10}-\frac{3}{16}a^{6}-\frac{1}{4}a^{2}$, $\frac{1}{32}a^{11}-\frac{3}{32}a^{7}-\frac{1}{2}a^{5}-\frac{1}{8}a^{3}-\frac{1}{2}a$, $\frac{1}{128}a^{12}-\frac{1}{16}a^{9}+\frac{5}{128}a^{8}-\frac{1}{8}a^{7}+\frac{7}{16}a^{5}-\frac{7}{32}a^{4}-\frac{1}{8}a^{3}-\frac{1}{2}a-\frac{1}{2}$, $\frac{1}{128}a^{13}+\frac{5}{128}a^{9}+\frac{9}{32}a^{5}$, $\frac{1}{512}a^{14}-\frac{1}{256}a^{13}-\frac{1}{256}a^{12}-\frac{11}{512}a^{10}+\frac{11}{256}a^{9}+\frac{11}{256}a^{8}+\frac{21}{128}a^{6}+\frac{11}{64}a^{5}-\frac{21}{64}a^{4}+\frac{1}{8}a^{2}+\frac{1}{4}a-\frac{1}{4}$, $\frac{1}{512}a^{15}-\frac{1}{256}a^{13}+\frac{5}{512}a^{11}-\frac{5}{256}a^{9}-\frac{7}{128}a^{7}-\frac{1}{4}a^{6}+\frac{7}{64}a^{5}-\frac{1}{8}a^{3}-\frac{1}{4}a^{2}+\frac{1}{4}a$
Monogenic: | No | |
Index: | Not computed | |
Inessential primes: | $2$ |
Class group and class number
$C_{2}$, which has order $2$
Unit group
Rank: | $7$ | sage: UK.rank()
gp: K.fu
magma: UnitRank(K);
oscar: rank(UK)
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Torsion generator: | \( -\frac{3}{128} a^{13} + \frac{17}{128} a^{9} - \frac{19}{32} a^{5} + a \) (order $8$) | sage: UK.torsion_generator()
gp: K.tu[2]
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
oscar: torsion_units_generator(OK)
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Fundamental units: | $\frac{1}{512}a^{15}+\frac{3}{512}a^{14}-\frac{1}{128}a^{13}+\frac{1}{256}a^{12}-\frac{11}{512}a^{11}-\frac{1}{512}a^{10}+\frac{3}{128}a^{9}-\frac{11}{256}a^{8}+\frac{5}{128}a^{7}+\frac{7}{128}a^{6}-\frac{7}{32}a^{5}+\frac{21}{64}a^{4}-\frac{1}{8}a^{2}-\frac{3}{4}$, $\frac{1}{512}a^{15}-\frac{3}{512}a^{14}-\frac{1}{128}a^{13}-\frac{1}{256}a^{12}-\frac{11}{512}a^{11}+\frac{1}{512}a^{10}+\frac{3}{128}a^{9}+\frac{11}{256}a^{8}+\frac{5}{128}a^{7}-\frac{7}{128}a^{6}-\frac{7}{32}a^{5}-\frac{21}{64}a^{4}+\frac{1}{8}a^{2}+\frac{3}{4}$, $\frac{1}{256}a^{15}-\frac{3}{256}a^{11}+\frac{1}{16}a^{10}-\frac{1}{64}a^{7}-\frac{3}{16}a^{6}-\frac{1}{8}a^{3}+\frac{3}{4}a^{2}+1$, $\frac{5}{512}a^{15}-\frac{5}{256}a^{13}+\frac{3}{128}a^{12}-\frac{23}{512}a^{11}-\frac{1}{16}a^{10}+\frac{23}{256}a^{9}-\frac{1}{128}a^{8}+\frac{17}{128}a^{7}+\frac{3}{16}a^{6}-\frac{17}{64}a^{5}+\frac{7}{32}a^{4}-\frac{1}{8}a^{3}-\frac{3}{4}a^{2}+\frac{1}{4}a+\frac{1}{2}$, $\frac{5}{512}a^{15}-\frac{5}{256}a^{13}-\frac{3}{128}a^{12}-\frac{23}{512}a^{11}+\frac{1}{16}a^{10}+\frac{23}{256}a^{9}+\frac{1}{128}a^{8}+\frac{17}{128}a^{7}-\frac{3}{16}a^{6}-\frac{17}{64}a^{5}-\frac{7}{32}a^{4}-\frac{1}{8}a^{3}+\frac{3}{4}a^{2}+\frac{1}{4}a-\frac{1}{2}$, $\frac{5}{256}a^{15}+\frac{1}{128}a^{14}+\frac{1}{32}a^{12}-\frac{31}{256}a^{11}-\frac{11}{128}a^{10}-\frac{7}{32}a^{8}+\frac{23}{64}a^{7}+\frac{13}{32}a^{6}+\frac{3}{4}a^{4}-\frac{1}{8}a^{3}-\frac{3}{4}a^{2}-1$, $\frac{1}{256}a^{15}-\frac{1}{128}a^{14}+\frac{1}{128}a^{13}-\frac{11}{256}a^{11}+\frac{3}{128}a^{10}+\frac{5}{128}a^{9}+\frac{5}{64}a^{7}+\frac{1}{32}a^{6}-\frac{7}{32}a^{5}-\frac{3}{4}a^{2}+\frac{3}{2}a$ | sage: UK.fundamental_units()
gp: K.fu
magma: [K|fUK(g): g in Generators(UK)];
oscar: [K(fUK(a)) for a in gens(UK)]
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Regulator: | \( 22598.9729953 \) | sage: K.regulator()
gp: K.reg
magma: Regulator(K);
oscar: regulator(K)
|
Class number formula
\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{0}\cdot(2\pi)^{8}\cdot 22598.9729953 \cdot 2}{8\cdot\sqrt{29960650073923649536}}\cr\approx \mathstrut & 2.50721768558 \end{aligned}\]
Galois group
$C_2\times D_4$ (as 16T9):
A solvable group of order 16 |
The 10 conjugacy class representatives for $D_4\times C_2$ |
Character table for $D_4\times C_2$ |
Intermediate fields
Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.
Sibling fields
Degree 8 siblings: | 8.0.342102016.5, 8.0.5473632256.3, 8.0.18939904.2, 8.0.1368408064.5 |
Minimal sibling: | 8.0.18939904.2 |
Frobenius cycle types
$p$ | $2$ | $3$ | $5$ | $7$ | $11$ | $13$ | $17$ | $19$ | $23$ | $29$ | $31$ | $37$ | $41$ | $43$ | $47$ | $53$ | $59$ |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cycle type | R | ${\href{/padicField/3.4.0.1}{4} }^{4}$ | ${\href{/padicField/5.4.0.1}{4} }^{4}$ | ${\href{/padicField/7.2.0.1}{2} }^{8}$ | ${\href{/padicField/11.4.0.1}{4} }^{4}$ | ${\href{/padicField/13.2.0.1}{2} }^{8}$ | R | ${\href{/padicField/19.2.0.1}{2} }^{8}$ | ${\href{/padicField/23.2.0.1}{2} }^{8}$ | ${\href{/padicField/29.4.0.1}{4} }^{4}$ | ${\href{/padicField/31.2.0.1}{2} }^{8}$ | ${\href{/padicField/37.4.0.1}{4} }^{4}$ | ${\href{/padicField/41.2.0.1}{2} }^{8}$ | ${\href{/padicField/43.2.0.1}{2} }^{8}$ | ${\href{/padicField/47.2.0.1}{2} }^{8}$ | ${\href{/padicField/53.2.0.1}{2} }^{8}$ | ${\href{/padicField/59.2.0.1}{2} }^{8}$ |
In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.
Local algebras for ramified primes
$p$ | Label | Polynomial | $e$ | $f$ | $c$ | Galois group | Slope content |
---|---|---|---|---|---|---|---|
\(2\) | 2.4.8.2 | $x^{4} + 2 x^{2} + 4 x + 2$ | $4$ | $1$ | $8$ | $C_2^2$ | $[2, 3]$ |
2.4.8.2 | $x^{4} + 2 x^{2} + 4 x + 2$ | $4$ | $1$ | $8$ | $C_2^2$ | $[2, 3]$ | |
2.4.8.2 | $x^{4} + 2 x^{2} + 4 x + 2$ | $4$ | $1$ | $8$ | $C_2^2$ | $[2, 3]$ | |
2.4.8.2 | $x^{4} + 2 x^{2} + 4 x + 2$ | $4$ | $1$ | $8$ | $C_2^2$ | $[2, 3]$ | |
\(17\) | 17.4.2.1 | $x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ |
17.4.2.1 | $x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ | |
17.4.2.1 | $x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ | |
17.4.2.1 | $x^{4} + 338 x^{3} + 31049 x^{2} + 420472 x + 123735$ | $2$ | $2$ | $2$ | $C_2^2$ | $[\ ]_{2}^{2}$ |