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Search: MSC category 11R29 ( Class numbers, class groups, discriminants )

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1. CMB 2011 (vol 56 pp. 148)

Oukhaba, Hassan; Viguié, Stéphane
 On the Gras Conjecture for Imaginary Quadratic Fields In this paper we extend K. Rubin's methods to prove the Gras conjecture for abelian extensions of a given imaginary quadratic field $k$ and prime numbers $p$ that divide the number of roots of unity in $k$. Keywords:elliptic units, Stark units, Gras conjecture, Euler systemsCategories:11R27, 11R29, 11G16

2. CMB 2011 (vol 55 pp. 774)

Mollin, R. A.; Srinivasan, A.
 Pell Equations: Non-Principal Lagrange Criteria and Central Norms We provide a criterion for the central norm to be any value in the simple continued fraction expansion of $\sqrt{D}$ for any non-square integer $D>1$. We also provide a simple criterion for the solvability of the Pell equation $x^2-Dy^2=-1$ in terms of congruence conditions modulo $D$. Keywords:Pell's equation, continued fractions, central normsCategories:11D09, 11A55, 11R11, 11R29

3. CMB 2011 (vol 54 pp. 330)

Mouhib, A.
 Sur la borne infÃ©rieure du rang du 2-groupe de classes de certains corps multiquadratiques Soient $p_1,p_2,p_3$ et $q$ des nombres premiers distincts tels que $p_1\equiv p_2\equiv p_3\equiv -q\equiv 1 \pmod{4}$, $k = \mathbf{Q} (\sqrt{p_1}, \sqrt{p_2}, \sqrt{p_3}, \sqrt{q})$ et $\operatorname{Cl}_2(k)$ le $2$-groupe de classes de $k$. A. FrÃ¶hlich a dÃ©montrÃ© que $\operatorname{Cl}_2(k)$ n'est jamais trivial. Dans cet article, nous donnons une extension de ce rÃ©sultat, en dÃ©montrant que le rang de $\operatorname{Cl}_2(k)$ est toujours supÃ©rieur ou Ã©gal Ã  $2$. Nous dÃ©montrons aussi, que la valeur $2$ est optimale pour une famille infinie de corps $k$. Keywords:class group, units, multiquadratic number fieldsCategories:11R29, 11R11

4. CMB 2009 (vol 52 pp. 583)

Konstantinou, Elisavet; Kontogeorgis, Aristides
 Computing Polynomials of the Ramanujan $t_n$ Class Invariants We compute the minimal polynomials of the Ramanujan values $t_n$, where $n\equiv 11 \mod 24$, using the Shimura reciprocity law. These polynomials can be used for defining the Hilbert class field of the imaginary quadratic field $\mathbb{Q}(\sqrt{-n})$ and have much smaller coefficients than the Hilbert polynomials. Categories:11R29, 33E05, 11R20

5. CMB 2006 (vol 49 pp. 448)

Pacelli, Allison M.
 A Lower Bound on the Number of Cyclic Function Fields With Class Number Divisible by $n$ In this paper, we find a lower bound on the number of cyclic function fields of prime degree~$l$ whose class numbers are divisible by a given integer $n$. This generalizes a previous result of D. Cardon and R. Murty which gives a lower bound on the number of quadratic function fields with class numbers divisible by $n$. Categories:11R29, 11R58

6. CMB 2006 (vol 49 pp. 472)

Silvester, Alan K.; Spearman, Blair K.; Williams, Kenneth S.
 Cyclic Cubic Fields of Given Conductor and Given Index The number of cyclic cubic fields with a given conductor and a given index is determined. Keywords:Discriminant, conductor, index, cyclic cubic fieldCategories:11R16, 11R29

7. CMB 2002 (vol 45 pp. 138)

Spearman, Blair K.; Williams, Kenneth S.
 The Discriminant of a Dihedral Quintic Field Defined by a Trinomial $X^5 + aX + b$ Let $X^5 + aX + b \in Z[X]$ have Galois group $D_5$. Let $\theta$ be a root of $X^5 + aX + b$. An explicit formula is given for the discriminant of $Q(\theta)$. Keywords:dihedral quintic field, trinomial, discriminantCategories:11R21, 11R29

8. CMB 2002 (vol 45 pp. 86)

Gerth, Frank
 On Cyclic Fields of Odd Prime Degree $p$ with Infinite Hilbert $p$-Class Field Towers Let $k$ be a cyclic extension of odd prime degree $p$ of the field of rational numbers. If $t$ denotes the number of primes that ramify in $k$, it is known that the Hilbert $p$-class field tower of $k$ is infinite if $t>3+2\sqrt p$. For each $t>2+\sqrt p$, this paper shows that a positive proportion of such fields $k$ have infinite Hilbert $p$-class field towers. Categories:11R29, 11R37, 11R45

9. CMB 2001 (vol 44 pp. 398)

Cardon, David A.; Ram Murty, M.
 Exponents of Class Groups of Quadratic Function Fields over Finite Fields We find a lower bound on the number of imaginary quadratic extensions of the function field $\F_q(T)$ whose class groups have an element of a fixed order. More precisely, let $q \geq 5$ be a power of an odd prime and let $g$ be a fixed positive integer $\geq 3$. There are $\gg q^{\ell (\frac{1}{2}+\frac{1}{g})}$ polynomials $D \in \F_q[T]$ with $\deg(D) \leq \ell$ such that the class groups of the quadratic extensions $\F_q(T,\sqrt{D})$ have an element of order~$g$. Keywords:class number, quadratic function fieldCategories:11R58, 11R29

10. CMB 2001 (vol 44 pp. 97)

Ou, Zhiming M.; Williams, Kenneth S.
 On the Density of Cyclic Quartic Fields An asymptotic formula is obtained for the number of cyclic quartic fields over $Q$ with discriminant $\leq x$. Keywords:cyclic quartic fields, density, discriminantCategories:11R16, 11R29

11. CMB 2000 (vol 43 pp. 218)

Mollin, R. A.; van der Poorten, A. J.
 Continued Fractions, Jacobi Symbols, and Quadratic Diophantine Equations The results herein continue observations on norm form equations and continued fractions begun and continued in the works \cite{chows}--\cite{mol}, and \cite{mvdpw}--\cite{schinz}. Categories:11R11, 11D09, 11R29, 11R65

12. CMB 1999 (vol 42 pp. 427)

Berndt, Bruce C.; Chan, Heng Huat
 Ramanujan and the Modular $j$-Invariant A new infinite product $t_n$ was introduced by S.~Ramanujan on the last page of his third notebook. In this paper, we prove Ramanujan's assertions about $t_n$ by establishing new connections between the modular $j$-invariant and Ramanujan's cubic theory of elliptic functions to alternative bases. We also show that for certain integers $n$, $t_n$ generates the Hilbert class field of $\mathbb{Q} (\sqrt{-n})$. This shows that $t_n$ is a new class invariant according to H.~Weber's definition of class invariants. Keywords:modular functions, the Borweins' cubic theta-functions, Hilbert class fieldsCategories:33C05, 33E05, 11R20, 11R29

13. CMB 1998 (vol 41 pp. 328)

Mollin, R. A.
 Class number one and prime-producing quadratic polynomials revisited Over a decade ago, this author produced class number one criteria for real quadratic fields in terms of prime-producing quadratic polynomials. The purpose of this article is to revisit the problem from a new perspective with new criteria. We look at the more general situation involving arbitrary real quadratic orders rather than the more restrictive field case, and use the interplay between the various orders to provide not only more general results, but also simpler proofs. Categories:11R11, 11R09, 11R29

14. CMB 1997 (vol 40 pp. 214)

Mollin, R. A.; Goddard, B.; Coupland, S.
 Polynomials of quadratic type producing strings of primes The primary purpose of this paper is to provide necessary and sufficient conditions for certain quadratic polynomials of negative discriminant (which we call Euler-Rabinowitsch type), to produce consecutive prime values for an initial range of input values less than a Minkowski bound. This not only generalizes the classical work of Frobenius, the later developments by Hendy, and the generalizations by others, but also concludes the line of reasoning by providing a complete list of all such prime-producing polynomials, under the assumption of the generalized Riemann hypothesis ($\GRH$). We demonstrate how this prime-production phenomenon is related to the exponent of the class group of the underlying complex quadratic field. Numerous examples, and a remaining conjecture, are also given. Categories:11R11, 11R09, 11R29
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