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Showing results 1 to 20 of 38
  The ABCD of cyclic quadrilateralsBegalla, Engjell  ; Perucca, Antonella Article for general public (in press) Detailed reference viewed: 58 (0 UL) Kummer theory for number fieldsPerucca, Antonella ; Sgobba, Pietro ; Tronto, Sebastiano in Proceedings of the Roman Number Theory Association (2020) Detailed reference viewed: 49 (9 UL) Kummer theory for number fields and the reductions of algebraic numbers IIPerucca, Antonella ; Sgobba, Pietro in Uniform Distribution Theory (2020) Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. For almost all primes p of K, we consider the order of the cyclic group (G mod p), and ask whether this number ... [more ▼] Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. For almost all primes p of K, we consider the order of the cyclic group (G mod p), and ask whether this number lies in a given arithmetic progression. We prove that the density of primes for which the condition holds is, under some general assumptions, a computable rational number which is strictly positive. We have also discovered the following equidistribution property: if \ell^e is a prime power and a is a multiple of \ell (and a is a multiple of 4 if \ell=2), then the density of primes p of K such that the order of (G mod p) is congruent to a modulo \ell^e only depends on a through its \ell-adic valuation. [less ▲] Detailed reference viewed: 118 (17 UL)De zeven bruggen van KoningsbergenPerucca, Antonella Article for general public (2020) Detailed reference viewed: 20 (3 UL)De 15-puzzelPerucca, Antonella Article for general public (2020) Detailed reference viewed: 79 (4 UL)Visualisierungen des InduktionsprinzipsPerucca, Antonella ; in Beiträge zum Mathematikunterricht 2020 (2020) Detailed reference viewed: 34 (6 UL)Vier punten, twee afstandenPerucca, Antonella in Uitwiskeling (2020) Detailed reference viewed: 42 (1 UL)Explicit Kummer theory for the rational numbersPerucca, Antonella ; Sgobba, Pietro ; Tronto, Sebastiano in International Journal of Number Theory (2020) Let G be a finitely generated multiplicative subgroup of Q* having rank r. The ratio between n^r and the Kummer degree [Q(\zeta_m,\sqrt[n]{G}) : Q(\zeta_m)], where n divides m, is bounded independently of ... [more ▼] Let G be a finitely generated multiplicative subgroup of Q* having rank r. The ratio between n^r and the Kummer degree [Q(\zeta_m,\sqrt[n]{G}) : Q(\zeta_m)], where n divides m, is bounded independently of n and m. We prove that there exist integers m_0, n_0 such that the above ratio depends only on G, \gcd(m,m_0), and \gcd(n,n_0). Our results are very explicit and they yield an algorithm that provides formulas for all the above Kummer degrees (the formulas involve a finite case distinction). [less ▲] Detailed reference viewed: 148 (25 UL)Veelvouden van 3 gradenPerucca, Antonella ; Stranen, Deborah Article for general public (2019) Detailed reference viewed: 45 (6 UL)Reductions of elliptic curvesPerucca, Antonella in Proceedings of the Roman Number Theory Association (2019), 4 Detailed reference viewed: 90 (8 UL)Het kunstgalerijprobleemPerucca, Antonella Article for general public (2019) Detailed reference viewed: 43 (8 UL)Addendum to: Reductions of algebraic integersPerucca, Antonella ; Sgobba, Pietro ; Tronto, Sebastiano E-print/Working paper (2019) Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. We consider Kummer extensions of G of the form K(\zeta_{2^m}, \sqrt[2^n]G)/K(\zeta_{2^m}), where n \leq m. In ... [more ▼] Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. We consider Kummer extensions of G of the form K(\zeta_{2^m}, \sqrt[2^n]G)/K(\zeta_{2^m}), where n \leq m. In the paper "Reductions of algebraic integers" (J. Number Theory, 2016) by Debry and Perucca, the degrees of those extensions have been evaluated in terms of divisibility parameters over K(\zeta_4). We prove how properties of G over K explicitly determine the divisibility parameters over K(\zeta_4). This result has a clear computational advantage, since no field extension is required. [less ▲] Detailed reference viewed: 118 (22 UL)Kummer theory for number fields and the reductions of algebraic numbersPerucca, Antonella ; Sgobba, Pietro E-print/Working paper (2019) For all number fields the failure of maximality for the Kummer extensions is bounded in a very strong sense. We give a direct proof (without relying on the Bashmakov-Ribet method) of the fact that if G is ... [more ▼] For all number fields the failure of maximality for the Kummer extensions is bounded in a very strong sense. We give a direct proof (without relying on the Bashmakov-Ribet method) of the fact that if G is a finitely generated and torsion-free multiplicative subgroup of a number field K having rank r, then the ratio between n^r and the Kummer degree [K(\zeta_n,\sqrt[n]{G}):K(\zeta_n)] is bounded independently of n. We then apply this result to generalise to higher rank a theorem of Ziegler from 2006 about the multiplicative order of the reductions of algebraic integers (the multiplicative order must be in a given arithmetic progression, and an additional Frobenius condition may be considered). [less ▲] Detailed reference viewed: 185 (37 UL)MultiverzamelingPerucca, Antonella Article for general public (2019) Detailed reference viewed: 6 (1 UL)Tactile Tools for Teaching: Implementing Knuth's Algorithm for Mastering MastermindPerucca, Antonella ; ; in College Mathematics Journal (2018) Detailed reference viewed: 44 (2 UL)Arithmetic billiardsPerucca, Antonella Article for general public (2018) Detailed reference viewed: 51 (5 UL)Math around the ClockPerucca, Antonella Article for general public (2018) This is an article for the general public about mathematical clocks. Several original mathematical clocks are also presented. Detailed reference viewed: 66 (7 UL)Understanding the Babylonian tablet ‘Plimpton 322’ with the decimal systemPerucca, Antonella ; E-print/Working paper (2018) Detailed reference viewed: 51 (1 UL)Reductions of algebraic integers IIPerucca, Antonella in Association for Women in Mathematics Series (2018) Detailed reference viewed: 101 (7 UL)Reductions of one-dimensional tori IIPerucca, Antonella in Association for Women in Mathematics Series (2018) Detailed reference viewed: 86 (1 UL)
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