**Robert Tichy** (Technische Universität Graz, Austria):

Additive representation of algebraic integers

October 25, 2006

**Volker Ziegler** (Technische Universität Graz, Austria):

A variant of Artin's primitive root conjecture

October 25, 2006

**Günter Lettl** (Karl-Franzens-Universität Graz, Austria):

On a conjecture of E. Thomas

November 15, 2006

**Bernadin Ibrahimpasic:** Dimension of an algebraic variety

November 22, 2006

**Yann Bugeaud** (Université Louis Pasteur, Strasbourg, France):

On the convergents to algebraic numbers

December 1, 2006

**Alan Filipin:** Nonexistence of *D*(4)-sextuples

December 13, 2006

**Odile Lecacheux** (Université Pierre et Marie Curie - Paris 6, France):

Elliptic surfaces and elliptic fibrations

January 25, 2007

**Filip Najman:** Representation of primes by quadratic forms

February 7, 2007

**Tomislav Sikic:** An extension of the classical Gauss *q*-series identity

March 21, 2007

**Ivan Soldo:** Numerical computation of zeroes of Riemann Zeta function

April 25, 2007

**Goran Conar:** Sums of three squares

May 2, 2007

**Kristina Krulic:** Ramanujan-Nagell equation

May 16, 2007

**Matija Kazalicki:** Zeros of certain Drinfeld modular functions

June 6, 2007

**Filip Najman:** Compact representation and algorithms for solving the Pell equation

June 13, 2007

**Ivan Soldo:** Criteria for solvability of Pellian equation
*x*^{2} - *d**y*^{2} = ± 2

June 20, 2007

**Tomislav Pejkovic:** Resultants of polynomials and systems of polynomial equations

July 11, 2007

**Vinko Petricevic:** Polynomial Pell's equation

July 11, 2007

**Danijel Krizmanic:** Delaunay-Nagell theorem on the equation
*x*^{3} - *d**y*^{3} = 1

September 5, 2007

**Andrijana Radovcic:**
Nonexistence of points of order 11 on elliptic curves over **Q**

September 5, 2007

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