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Finite projective planes, Fermat curves, and Gaussian periods

Koen Thas, Don Zagier (2008)

Journal of the European Mathematical Society

One of the oldest and most fundamental problems in the theory of finite projective planes is to classify those having a group which acts transitively on the incident point-line pairs (flags). The conjecture is that the only ones are the Desarguesian projective planes (over a finite field). In this paper, we show that non-Desarguesian finite flag-transitive projective planes exist if and only if certain Fermat surfaces have no nontrivial rational points, and formulate several other equivalences involving...

Finiteness of a class of Rabinowitsch polynomials

Jan-Christoph Schlage-Puchta (2004)

Archivum Mathematicum

We prove that there are only finitely many positive integers m such that there is some integer t such that | n 2 + n - m | is 1 or a prime for all n [ t + 1 , t + m ] , thus solving a problem of Byeon and Stark.

Finiteness of odd perfect powers with four nonzero binary digits

Pietro Corvaja, Umberto Zannier (2013)

Annales de l’institut Fourier

We prove that there are only finitely many odd perfect powers in having precisely four nonzero digits in their binary expansion. The proofs in fact lead to more general results, but we have preferred to limit ourselves to the present statement for the sake of simplicity and clarity of illustration of the methods. These methods combine various ingredients: results (derived from the Subspace Theorem) on integer values of analytic series at S -unit points (in a suitable ν -adic convergence), Roth’s...

Finiteness results for Diophantine triples with repdigit values

Attila Bérczes, Florian Luca, István Pink, Volker Ziegler (2016)

Acta Arithmetica

Let g ≥ 2 be an integer and g be the set of repdigits in base g. Let g be the set of Diophantine triples with values in g ; that is, g is the set of all triples (a,b,c) ∈ ℕ³ with c < b < a such that ab + 1, ac + 1 and bc + 1 lie in the set g . We prove effective finiteness results for the set g .

Finiteness Theorems for Deformations of Complexes

Frauke M. Bleher, Ted Chinburg (2013)

Annales de l’institut Fourier

We consider deformations of bounded complexes of modules for a profinite group G over a field of positive characteristic. We prove a finiteness theorem which provides some sufficient conditions for the versal deformation of such a complex to be represented by a complex of G -modules that is strictly perfect over the associated versal deformation ring.

Finitude de tours et p -tours T -ramifiées modérées, S -décomposées

Christian Maire (1996)

Journal de théorie des nombres de Bordeaux

Soit k un corps de nombres et soient T et S deux ensembles finis de places de k ; on peut définir la tour de Hilbert de k , T -ramifiée modérée, S -décomposée. Ceci permet d’obtenir, par exemple, la notion de tour de Hilbert au sens classique et de tour de Hilbert au sens restreint. On donne alors d’une part, un critère de finitude de cette nouvelle tour, critère construit à partir d’un résultat d’Odlyzko, puis d’autre part deux critères de non-finitude, le premier étant une conséquence d’un résultat...

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