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Fundamental units for orders of unit rank 1 and generated by a unit

Stéphane R. Louboutin (2016)

Banach Center Publications

Let ε be an algebraic unit for which the rank of the group of units of the order ℤ[ε] is equal to 1. Assume that ε is not a complex root of unity. It is natural to wonder whether ε is a fundamental unit of this order. It turns out that the answer is in general yes, and that a fundamental unit of this order can be explicitly given (as an explicit polynomial in ε) in the rare cases when the answer is no. This paper is a self-contained exposition of the solution to this problem, solution which was...

Fundamental units in a family of cubic fields

Veikko Ennola (2004)

Journal de Théorie des Nombres de Bordeaux

Let 𝒪 be the maximal order of the cubic field generated by a zero ε of x 3 + ( - 1 ) x 2 - x - 1 for , 3 . We prove that ε , ε - 1 is a fundamental pair of units for 𝒪 , if [ 𝒪 : [ ε ] ] / 3 .

Funzione generatrice e polinomi incompleti di Fibonacci e Lucas

Wenchang Chu, Valentina Vicenti (2003)

Bollettino dell'Unione Matematica Italiana

I numeri incompleti di Fibonacci e di Lucas, introdotti da Filipponi (1996), sono entrambi generalizzati in forma di polinomi. Le loro funzioni generatrici ridondanti, naturali e condizionate sono stabilite attraverso serie formali di potenze. Le funzioni generatrici relative alle sequenze di numeri dovute a Pinter e Srivastava (1999) sono contenute come casi particolari.

Further remarks on Diophantine quintuples

Mihai Cipu (2015)

Acta Arithmetica

A set of m positive integers with the property that the product of any two of them is the predecessor of a perfect square is called a Diophantine m-tuple. Much work has been done attempting to prove that there exist no Diophantine quintuples. In this paper we give stringent conditions that should be met by a putative Diophantine quintuple. Among others, we show that any Diophantine quintuple a,b,c,d,e with a < b < c < d < e s a t i s f i e s d < 1.55·1072 a n d b < 6.21·1035 w h e n 4 a < b , w h i l e f o r b < 4 a o n e h a s e i t h e r c = a + b + 2√(ab+1) and d < 1 . 96 · 10 53 ...

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