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21
On Diophantine definability and decidability in large subrings of totally real number fields and their totally complex extensions of degree 2
, 2001
"... Let M be a number field. Let W be a set of nonarchimedean primes of M . Let OM,W = {x # M  ord p x # 0 #p ## W}. The author continues her investigation of Diophantine definability and decidability in rings OM,W where W is infinite. In this paper she improves her previous density estimat ..."
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Cited by 12 (11 self)
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Let M be a number field. Let W be a set of nonarchimedean primes of M . Let OM,W = {x # M  ord p x # 0 #p ## W}. The author continues her investigation of Diophantine definability and decidability in rings OM,W where W is infinite. In this paper she improves her previous density estimates and extends the results to the totally complex extensions of degree 2 of the totally real fields. In particular, the following results are proved. Let M be a totally real field or a totally complex extension of degree 2 of a totally real field. Then for any # > 0 there exists a set WM of primes of M whose density is bigger than 1  [M : Q] 1  # and such that Z has a Diophantine definition over OM,WM . (Thus, Hilbert's Tenth Problem is undecidable in OM,WM .) Let M be as above and let # > 0 be given. Let SQ be the set of all rational primes splitting in M . (If the extension is Galois but not cyclic, SQ contains all the rational primes.) Then there exists a set of Mprimes WM such that the set of rational primes WQ below WM di#ers from SQ by a set contained in a set of density less than # and such that Z has a Diophantine definition over OM,WM . (Again this will imply that Hilbert's Tenth Problem is undecidable in OM,WM .) 1
Using Elliptic Curves of Rank One towards the Undecidability of Hilbert's Tenth Problem over Rings of Algebraic Integers
"... Let F be their rings of integers. If there exists an elliptic curve E over F such that rk E(F ) = rk E(K) = 1, then there exists a diophantine definition of . ..."
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Cited by 12 (2 self)
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Let F be their rings of integers. If there exists an elliptic curve E over F such that rk E(F ) = rk E(K) = 1, then there exists a diophantine definition of .
DEFINING INTEGRALITY AT PRIME SETS OF HIGH DENSITY IN NUMBER FIELDS
 VOL. 101, NO. 1 DUKE MATHEMATICAL JOURNAL
, 2000
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Open Diophantine Problems
 MOSCOW MATHEMATICAL JOURNAL
, 2004
"... Diophantine Analysis is a very active domain of mathematical research where one finds more conjectures than results. We collect here a number of open questions concerning Diophantine equations (including Pillai’s Conjectures), Diophantine approximation (featuring the abc Conjecture) and transcendent ..."
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Cited by 10 (3 self)
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Diophantine Analysis is a very active domain of mathematical research where one finds more conjectures than results. We collect here a number of open questions concerning Diophantine equations (including Pillai’s Conjectures), Diophantine approximation (featuring the abc Conjecture) and transcendental number theory (with, for instance, Schanuel’s Conjecture). Some questions related to Mahler’s measure and Weil absolute logarithmic height are then considered (e. g., Lehmer’s Problem). We also discuss Mazur’s question regarding the density of rational points on a variety, especially in the particular case of algebraic groups, in connexion with transcendence problems in several variables. We say only a few words on metric problems, equidistribution questions, Diophantine approximation on manifolds and Diophantine analysis on function fields.
Diophantine definability of infinite discrete nonarchimedean sets and Diophantine models for large subrings of number fields
"... We prove that some infinite padically discrete sets have Diophantine definitions in large subrings of number fields. First, if K is a totally real number field or a totally complex degree2 extension of a totally real number field, then for every prime p of K there exists a set of Kprimes S of d ..."
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Cited by 7 (6 self)
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We prove that some infinite padically discrete sets have Diophantine definitions in large subrings of number fields. First, if K is a totally real number field or a totally complex degree2 extension of a totally real number field, then for every prime p of K there exists a set of Kprimes S of density arbitrarily close to 1 such that there is an infinite padically discrete set that is Diophantine over the ring OK,S of Sintegers in K. Second, if K is a number field over which there exists an elliptic curve of rank 1, then there exists a set of Kprimes S of density 1 and an infinite Diophantine subset of OK,S that is vadically discrete for every place v of K. Third, if K is a number field over which there exists an elliptic curve of rank 1, then there exists a set of Kprimes S of density 1 such that there exists a Diophantine model of Z over OK,S. This line of research is motivated by a question of Mazur concerning the distribution of rational points on varieties in a nonarchimedean topology and questions concerning extensions of Hilbert’s Tenth Problem to subrings of number fields.
On diophantine definability and decidability in some infinite totally real extensions
 of Q, Trans. Amer. Math. Soc
"... Abstract. Let M be a number field, and WM a set of its nonArchimedean primes. Then let OM,W = {x ∈ M  ordt x ≥ 0, ∀t � ∈ WM}. Let{p1,...,pr} M be a finite set of prime numbers. Let Finf be the field generated by all the p j ith roots of unity as j → ∞ and i = 1,...,r. Let Kinf be the largest tot ..."
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Cited by 5 (5 self)
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Abstract. Let M be a number field, and WM a set of its nonArchimedean primes. Then let OM,W = {x ∈ M  ordt x ≥ 0, ∀t � ∈ WM}. Let{p1,...,pr} M be a finite set of prime numbers. Let Finf be the field generated by all the p j ith roots of unity as j → ∞ and i = 1,...,r. Let Kinf be the largest totally real subfield of Finf. Then for any ε>0, there exist a number field M ⊂ Kinf,andasetWMof nonArchimedean primes of M such that WM has density greater than 1 − ε, andZhas a Diophantine definition over the integral closure of OM,W in Kinf. M 1.
ELLIPTIC CURVES RETAINING THEIR RANK IN FINITE EXTENSIONS AND HILBERT’S TENTH PROBLEM FOR RINGS OF ALGEBRAIC NUMBERS
, 2008
"... Abstract. Using Poonen’s version of the “weak vertical method ” we produce new examples of “large ” and “small ” rings of algebraic numbers (including rings of integers) where Z and/or the ring of integers of a subfield are existentially definable and/or where the ring version of Mazur’s conjecture ..."
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Cited by 4 (4 self)
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Abstract. Using Poonen’s version of the “weak vertical method ” we produce new examples of “large ” and “small ” rings of algebraic numbers (including rings of integers) where Z and/or the ring of integers of a subfield are existentially definable and/or where the ring version of Mazur’s conjecture on the topology of rational points does not hold. 1.
Diophantine Undecidability of Function Fields of Characteristic Greater Than 2, Finitely Generated over Fields Algebraic over a Finite Field
, 2001
"... Let F be a function field of characteristic p>2, finitely generated over a field C algebraic over a finite field Cp and such that it has an extension of degree p. Then Hilbert's Tenth Problem is not decidable over F . 1 ..."
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Cited by 4 (3 self)
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Let F be a function field of characteristic p>2, finitely generated over a field C algebraic over a finite field Cp and such that it has an extension of degree p. Then Hilbert's Tenth Problem is not decidable over F . 1
DIOPHANTINE DEFINABILITY AND DECIDABILITY IN THE EXTENSIONS OF DEGREE 2 OF TOTALLY REAL FIELDS
, 2006
"... Abstract. We investigate Diophantine definability and decidability over some subrings of algebraic numbers contained in quadratic extensions of totally real algebraic extensions of Q. Among other results we prove the following. The big subring definability and undecidability results previously shown ..."
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Cited by 4 (3 self)
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Abstract. We investigate Diophantine definability and decidability over some subrings of algebraic numbers contained in quadratic extensions of totally real algebraic extensions of Q. Among other results we prove the following. The big subring definability and undecidability results previously shown by the author to hold over totally complex extensions of degree 2 of totally real number fields, are shown to hold for all extensions of degree 2 of totally real number fields. The definability and undecidability results for integral closures of “small ” and “big ” subrings of number fields in the infinite algebraic extensions of Q, previously shown by the author to hold for totally real fields, are extended to a large class of extensions of degree 2 of totally real fields. This class includes infinite cyclotomics and abelian extensions with finitely many ramified rational primes. 1.
COUNTING SPECIAL POINTS: LOGIC, DIOPHANTINE GEOMETRY AND TRANSCENDENCE THEORY
"... ABSTRACT. We expose a theorem of Pila and Wilkie on counting rational points in sets definable in ominimal structures and some applications of this theorem to problems in diophantine geometry due to Masser, Peterzil, Pila, Starchenko, and Zannier. 1. ..."
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Cited by 2 (2 self)
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ABSTRACT. We expose a theorem of Pila and Wilkie on counting rational points in sets definable in ominimal structures and some applications of this theorem to problems in diophantine geometry due to Masser, Peterzil, Pila, Starchenko, and Zannier. 1.