By Jörn Steuding (eds.)

This selection of direction notes from a host concept summer time college concentrate on points of Diophantine research, addressed to grasp and doctoral scholars in addition to every person who desires to study the topic. the subjects diversity from Baker’s approach to bounding linear varieties in logarithms (authored via Sanda Bujačić and Alan Filipin), metric diophantine approximation discussing specifically the but unsolved Littlewood conjecture (by Simon Kristensen), Minkowski’s geometry of numbers and glossy adaptations by means of Bombieri and Schmidt (Tapani Matala-aho), and a ancient account of similar quantity theory(ists) on the flip of the nineteenth Century (Nicola M.R. Oswald). each one of those notes serves as an basically self-contained creation to the subject. The reader will get an intensive influence of Diophantine research via its primary effects, correct functions and open difficulties. The notes are complemented with many references and an intensive check in which makes it effortless to navigate throughout the book.

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**Example text**

To finish, we compute the values of all Fibonacci numbers modulo 10000 (their last four digits) and convince ourselves that there are no Fibonacci numbers with the desired pattern in the range 11 ≤ n ≤ 1000. This example stems from [25, 36]. 3 37 Simultaneous Pellian Equations The following result is due to Baker and Davenport and was historically the first example of a successful use of lower bounds for linear forms in logarithms of algebraic numbers; it actually allowed the effective computation of all common members of two binary recurrent sequences with real roots; for more details see [19, 25, 36].

111]). 10) regular if (t, s) belongs to one of these three classes. However, it is possible for a solution (t, s) not to be regular. In general, we do not know in advance how many classes of solutions we have, except for some special type of b. 10 An example having non-regular solutions can be found in the case of r = 2q 2 , where q is a positive integer. 10) has two more classes of solutions belonging to (t0 , s0 ) = (2q 3 + q, ±q). Our goal is to prove the following theorem. 10) and let c = s 2 + 1.

Suppose that one of the following assumptions holds for an odd prime p and a positive integer k: (i) b = p; (ii) b = 2 p k ; (iii) r = p k ; (iv) r = 2 p k . 10) and c = s 2 + 1. Moreover, the D(−1)-pair {1, b} cannot be extended to a D(−1)-quadruple. 46 S. Bujaˇci´c and A. Filipin The System of Pellian Equations Let {1, b, c} be a D(−1)-triple with b < c, and let r , s, t be positive integers defined by b − 1 = r 2 , c − 1 = s 2 , bc − 1 = t 2 . Suppose that we can extend the triple {1, b, c} to a D(−1)-quadruple with element d.