20122013 Sessions
 March 26, 2013 (Tuesday), 4:00 p.m., Room 310/A: Presentations by MS students
 March 19, 2013 (Tuesday), 4:00 p.m., Room 310/A: Gabor Meszaros (PhD Candidate), Linkedness, orderedness and connectivity in graphs (45 minutes); Samuel Mellik (PhD Student), Polytopes, algorithms, and lowdimensional topology
 March 12, 2013 (Tuesday), 4:00 p.m., Room 310/A: Tugba Aslan (PhD Student), The Nottingham group (4050 minutes); Scott Kensell (PhD Candidate), TBA
 March 5, 2013 (Tuesday), 4:00 p.m., Room 310/A: Levente Nagy (PhD Candidate), Tannaka duality for affine group schemes (40  50 minutes)
 February 26, 2013 (Tuesday), 4:00 p.m., Room 310/A: Baldur Sigurdsson (PhD Candidate), Topology and analytic geometry in singularity theory
 February 19, 2013 (Tuesday), 4:00 p.m., Room 310/A: Mohamed Khalifa (PhD Student), The story of Mathematics
 February 12, 2013 (Tuesday), 4:00 p.m., Room 310/A: Alexa Gopaulsingh (PhD Candidate), Paradoxes in deontic logic
 February 5, 2013 (Tuesday), 4:00 p.m., Room 310/A: Casey Tompkins (PhD Candidate), Minimal saturation problems(3045 minutes)
 January 29, 2013 (Tuesday), 4:00 p.m., Room 310/A: Alexey Medvedev (PhD Student), The cyclic structure of the PrefixReversal sorting graph (3045 minutes) The online loopfree stochastic shortest path problem
 February 12, 2013(Tuesday), 4:00 p.m., Room 310/A:Alexa Gopaulsingh(PhD Candidate),Paradoxes in deontic logic
 February 5, 2013(Tuesday), 4:00 p.m., Room 310/A: Casey Tompkins(PhD Candidate),Minimal saturation problems(30  45 minutes)
 January 29, 2013(Tuesday), 4:00 p.m., Room 310/A: Alexey Medvedev(PhD Student), The cyclic structure of the PrefixReversal sorting graph
 January 22, 2013 (Tuesday), 4:00 p.m., Room 310/A: Nicusor Costea (PhD Candidate), On a nonsmooth elliptic eigenvalue problem
 January 15, 2013 (Tuesday), 4:00 p.m., Room 310/A: Muhammad Ahsan (PhD Candidate), Elliptic regularizations and asymptotic expansions for some semilinear differential equations (30 minutes); Samuel Mellik (PhD Student),Tetrahedra + cubes (30 minutes)
 January 8, 2013 (Tuesday), 4:00 p.m., Room 310/A: Máté Mánfay (PhD Candidate), Probabilistic $\mu$ (4560 minutes)
 December 4, 2012 (Tuesday), 4:00 p.m., Room 310/A: Daniel Joo (PhD Candidate), NagataHigman theorem
 November 20, 2012 (Tuesday), 4:00 p.m., Room 310/A: Scott Kensell (PhD Candidate), How to make graphs bipartite
 November 13, 2012 (Tuesday), 4:00 p.m., Room 310/A: Tamás Mészáros (PhD Candidate), Shattering extremal set systems of small VC dimension (1 hour)
 November 6, 2012 (Tuesday), 4:00 p.m., Room 310/A: Dorottya Sziraki (PhD Student), Vaught's conjecture and algebraic logic
 October 30, 2012 (Tuesday), 4:00 p.m., Room 310/A: Márton Erdélyi (PhD Candidate), The principal series representations of GL_n(Q_p) (30 minutes  1 hour)
 October 23, 2012: no session (Hungarian National Holiday)
 October 16, 2012 (Tuesday), 4:00 p.m., Room 310/A: Gergő Nemes (PhD Student), Exponential improvement of Hermite's asymptotic expansion for the Gamma function (1 hour)
 October 9, 2012 (Tuesday), 4:00 p.m., Room 310/A: Mohamed Khalifa (PhD Student), Completely representable atom structures (5060 minutes)
 October 2, 2012 (Tuesday), 4:00 p.m., Room 310/A: Nicusor Costea (PhD Candidate), On an elliptic differential inclusion involving variable exponents
 September 25, 2012 (Tuesday), 4:00 p.m., Room 310/A: Gábor Mészáros (PhD Candidate), Configurations in nonDesarguesian planes (45  60 minutes)
 September 18, 2012 (Tuesday), 4:00 p.m., Room 310/A: Gheorghe Morosanu (Professor, CEU), Differential Equations and Calculus of Variations
20112012 Sessions
 March 27, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Deniz Kaptan (PhD Candidate):The large sieve and applications
 March 20, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Casey Tompkins (PhD Student): Crossintersecting collections in extremal set theory
 March 13, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Gabor Meszaros (PhD Student), Byzantine agreement
 Abstract. Can unanimity be achieved in an unreliable distributed system? This problem was named the "Byzantine Generals Problem" by L. Lamport, R. Shostak, and M. Pease. The analysis of commnunicational protocols is a huge and even nowadays popular sub eld of Information Theory raising numerous applicationoriented questions. While agreement of the participants is a common requirement in such problems, the actual questions have wide spectrum depending on the attributes of the communication scheme. In my talk I will introduce the classical Byzantine Generals Problem which considers nerworks with reliable, authenticated, syncronous and pointtopoint communications and requests agreement in the presence of nontrusted participants. Related variants and recent problems will be also part of the discusson.
 March 6, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Alexa Gopaulsingh (PhD Student), TBA
 February 28, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Levente Nagy (PhD Student), Galois theory of linear differential equations
 Abstract: The aim of the talk is to present an elementary exposition of PicardVessiot theory. Given a homogeneous linear differential equation over a differential field (with algebraically closed field of constants), we will see that there exists a differential extension of the base field which is generated by a fundamental set of solutions and which is minimal with this property. Furthermore, we will discuss a Galois correspondence in this situation.
 February 21, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Baldur Sigurdsson (PhD Candidate), About the construction of analytic structures on given topological types of singularities
 February 14, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Mate Manfay (PhD Candidate): Identification of Levy systems
 February 7, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Muhammad Ahsan (PhD Candidate), Ellipticlike regularization of semilinear evolution equations
 January 31, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Bakhyt Alipova (Professor, IT International University, Almaty, Kazakhstan), Boundary integral equations in the problems of coupled thermoelastodynamics
 January 24, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Figen Ospinar (Professor, Afyon Kocatepe University, Turkey), Introduction to Partial Difference Equations
 January 17, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Fatih Nuray (Professor, Afyon Kocatepe University, Turkey),On statistical convergence
 January 10, 2012 (Tuesday), 4:00 p.m., Classroom 310/A: Gheorghe Morosanu (Professor, CEU), Asymptotic behavior of solutions to differential and difference equations associated with monotone operators
 December 6, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Alexa Gopaulsingh (Trinidad and Tobago, PhD Student),Osman Ali (Ethiopia, MS Student): Presentations about their countries, followed by a reception.
 November 29, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Daniel Joo (PhD Candidate), GIT moduli spaces of torus action (introduction)
 November 22, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Scott Kensell (PhD Student), Polyhedral combinatorics and the Perfect Graph Theorem
Abstract. The perfect graph theorem states that a graph is perfect iff its complement is perfect. This was conjectured by Berge and first proven in 1972 by Lovász. I will present a proof (also due to Lovász, but given later) which uses ideas of polyhedral combinatorics. The basic idea of polyhedral combinatorics is to construct a polytope in R^n given some graph on n vertices, try to fully describe the polytope geometrically (i.e. explicitly write all equations defining its facets), and in doing so, hopefully gain some insight to the structure of the graph.
 November 15, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Nicusor Costea (PhD Student), Existence results for hemivariational inequalities
 November 8, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Marton Erdelyi (PhD Student), The group structure of elliptic curves over finite fields
 November 1, 2011: National Holiday, no session!
 October 25, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Ivan Andrus (PhD Candidate),Transposes of character tables
 October 18, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Tamas Meszaros (PhD Candidate), Polynomials over division rings
 October 4 and 11, 2011, 4:00 p.m., Classroom 310/A: Peter Maga (PhD Candidate): Adeles and Tate's thesis
 September 27, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Andras Pongracz (PhD Candidate): Reducts of homogeneous structures
ZERO WEEK LECTURES
 September 12, 2011 (Monday), 10:0011:30 am: Andras Sereny (CEU Alumnus), Hidden Markov proceesses in speech recognition
 September 13, 2011 (Tuesday), 10:0011:30 am: Geza Toth (Renyi Institute), Some of my favourite problems in combinatorial geometry
 September 14, 2011 (Wednesday), 10:0011:30 am: Marianna Bolla (BME), C.R. Rao and the modern statistics; 3:004:30 pm: Alexandru Kristaly (BabesBolyai Univ., ClujNapoca, Romania), Singular elliptic problems involving asymmetric Minkowski norms
 September 15, 2011 (Thursday), 10:0011:30 am: Matyas Domokos (Renyi Institute), Modern algebra
 September 16, 2011 (Friday), 10:0011:30 am: Laszlo Gyorfi (BME and HAS), On nonparametric statistics
20102011 Sessions
 March 29, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Daniel Joo (PhD Candidate), Algebraic methods in reconstruction theory
 March 22, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Deniz Kaptan (PhD Candidate), Selberg sieve and applications
 March 15, 2011 (Tuesday): no session (Hungarian National Holiday)
 March 8, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Miklós Pálfia (MS Student), Classification of affine matrix means; Scott F. Kensell (MS Student), Intersections of longest paths
 March 1, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Tamas Meszaros (PhD Student), The combinatorial nullstellensazt and its generalizations
 February 22, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Muhammad Ahsan (PhD Student), The topological proof of Abel–Ruffini's theorem
 February 16, 2011 (Wednesday), 3:00 p.m., Classroom 310/A: Oganeditse A. Boikanyo (PhD Candidate): Iterative processes for solving nonlinear operator equations (thesis defense)
 February 8, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Ivan Andrus (PhD Candidate), A conjecture in character theory
 February 1, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Tamas Laszlo (PhD Candidate), Connections of lattice cohomology
 January 25, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Baldur Sigurdsson (PhD Student), The Milnor fiber of the singularity f(x,y)+zg(x,y)=0
 January 17, 2011 (Monday), 2:00 p.m., Renyi Institute: Balazs Komuves (PhD Candidate), On computing Thom polynomials (thesis defense)
 January 11, 2011 (Tuesday), 4:00 p.m., Classroom 310/A: Mate Manfay (PhD Student), Poincare inequality for interacting Markov processes
 December 3, 2010 (Friday) at 3:00 p.m., and December 9, 2010 (Thursday) at 3:00 p.m., Classroom 310/A: Daniel G. Glasscock (MS Student) and Peter Maga (PhD Candidate), Tao's proof of Szemerédi's theorem (too part lecture)
 November 23, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Miklos Palfia (MS Student), The ALM and the BMP procedure for matrix means

November 16, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Tamas Meszaros (PhD Student), Algebraic methods in combinatorics
 November 9, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Daniel G. Glasscock (MS Student), Partition regularity of finite and infinite matrices (continuation, 30 minutes); Alexander Dibert (MS Student), Secret sharing over infinite domains (30 minutes)
 November 2, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Daniel G. Glasscock (MS Student), Partition regularity of finite and infinite matrices
 October 29, 2010 ( Friday), Classroom 310/A, Workshop on Applied Mathematics: 8:30 a.m: Ferenc Szollosi, On the classification of complex Hadamard matrices of small orders; 9:10 a.m.: Oganeditse A. Boikanyo (PhD Candidate) and Gheorghe Morosanu, Inexact proximal point algorithms; 9:50 a.m.: Alexandru Kristaly (BabesBolyai University, ClujNapoca, Romania), A dimensiondepending multiplicity result for scalar field equations in $R^N$; 10:30 a.m., Eduard Feireisl (CEU and Czech Academy of Sciences), Scale analysis in fluid mechanics  Lunch Break  3:00 p.m.: Mihai Mihailescu (PhD Candidate), Eigenvalue problems for some elliptic partial differential operators (thesis defense).
 October 26, 2010 (Tuesday): no session (there is a defense + workshop soon thereafter, on Oct. 29, see above)

October 19, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Victor Shcherbacov (Academy of Sciences, Moldova), On direct decomposition of some finite quasigroups; Casey Tompkins (MS Student), Some problems in extremal set theory

October 12, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Andras Pongracz (PhD Candidate), Dichotomies in computational complexity

October 5, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Peter Maga (PhD Candidate), Topology in number theory(continuation)
 September 30, 2010 (Thursday), 10:00 a.m., Renyi Institute, Nagyterem (Big Hall): Peter Hussami (PhD Candidate),Statistical inference on random graphs (thesis defense)
 September 28, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Mihai Mihailescu (PhD Candidate), An eigenvale problem for an elliptic differential operator with the Neumann boundary condition (30 minutes); Peter Maga (PhD Candidate), Topology in number theory (30 minutes)

September 17, 2010 (Friday), 10:00 a.m., Classroom 310/A: Balint Virag, Modern probability theory

September 16, 2010 (Thursday), 10:00 a.m., Classroom 310/A: Laszlo Csirmaz (CEU), Nonstandard analysis

September 15, 2010 (Wednesday), 10:00 a.m., Classroom 310/A: Gyula O. H. Katona (Renyi Institute), Extremal combinatorial problems and their continuous versions

September 14, 2010 (Tuesday), 10:00 a.m., Classroom 310/A: Balazs Patkos (Renyi Institute), External set theory  even less than an introduction
 September 13, 2010 (Monday), 10:00 a.m., Classroom 310/A: Marianna Bolla (BME, Budapest), Some paradoxes of probability and statistics
20092010 Sessions
 July 1, 2010 (Thursday), 10:00 a.m., Classroom 310/A: Martin Le Doux Mbele Bidima (PhD Candidate), Asymptotic arbitrage strategies for longterm investments in discretetime financial markets (thesis defense).
 April 27, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Abdullo Tabarov (Tajik State National University), Linear quasigroups.
 March 9, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Miklós Pálfia (MS Student), Hermitian symmetric metrics on the convex cone of positive definite matrices.
 March 2, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Miklós Pálfia (MS Student), Extensions of matrix means to several variables.
 February 23, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Kostadinka Lapkova (PhD Candidate), On the class number one problem for certain real quadratic fields.
 February 16, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: András Pongrácz (PhD Student), Infinite permutation groups and model theory.
 February 12, 2010 (Friday), 10:30 a.m., Classroom 310/A: Stepan A. Tersian (Univ. of Rousse, Bulgaria), Decreasing and fast solutions for a second order difference equation related to the FisherKolmogorov equation.
 February 12, 2010 (Friday), 11:20 a.m., Classroom 310/A: Mihai Mihăilescu (PhD Candidate), Degenerate elliptic equations involving variable exponent growth conditions.
 February 12, 2010 (Friday), 11:50 a.m., Classroom 310/A: Oganeditse A. Boikanyo (PhD Candidate), The proximal pont algorithm.
 February 12, 2010 (Friday), 12:30 a.m., Classroom 310/A: Martin Le Doux Mbele Bidima (PhD Candidate), Linear asymptotic arbitrage in discretetime financial markets.
 February 12, 2010 (Friday), 2:00 p.m., Classroom 310/A: Tihomir Gyulov (PhD Candidate), Solvability of some nonlinear fourth order boundary value problems (thesis defense).
 February 12, 2010 (Friday), 3:30 p.m., Classroom 310/A: Alexandru Kristály (PhD Candidate), Economic optimization problems via RiemannFinsler geometry (thesis defense).
 January 12, 2010 (Tuesday), 4:00 p.m., Classroom 310/A: Vajk Sécsi (PhD Student), Walks on (hyper)graphs from an extremal point of view.
 November 24, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Pál Hegedűs (CEU), Two ways to compute the value of the Gauss sum.
 November 17, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Dániel Joó (PhD Student), Quivers and complete intersections.
 November 3, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Ivan Andrus (PhD Student), Matrix representations of automorphism groups of free groups.
 October 27, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Kálmán Cziszter (PhD Student), Zerosum sequences in Abelian groups and their applications (continuation).
 October 20, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Kálmán Cziszter (PhD Student), Zerosum sequences in Abelian groups and their applications.
 October 13, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: András Pongrácz (PhD Student), Affine complete Gsets(continuation).
 October 6, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: András Pongrácz (PhD Student), Affine complete Gsets.
 September 29, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Péter Maga (PhD Student), Two aspects of the largeness of sets.
 September 22, 2009 (Tuesday), 4:00 p.m., Classroom 310/A: Gheorghe Morosanu (CEU), Eigennvalues and eigenvectors of linear and nonlinear operators.
 September 18, 2009 (Friday), 10:00 a.m., Classroom 310/A: Mátyás Domokos (CEU and Rényi Institute), Higher linear algebra and invariant theory.
 September 17, 2009 (Thursday), 10:00 a.m., Classroom 310/A: Gergely Harcos (Rényi Institute), Basic Lfunctions.
 September 16, 2009 (Wednesday), 11:30 a.m., Classroom 310/A: Marianna Bolla (BME), Birthday holidays, secretary problem and to believe or not?
 September 16, 2009 (Wednesday), 10:00 a.m., Classroom 310/A: László Csirmaz (CEU), Secret sharing.
 September 15, 2009 (Tuesday), 10:00 a.m., Classroom 310/A: Istvan Miklós (CEU and Rényi Institue), A greedy algorithm to construct directed graphs with prescribed degree sequence pairs.
 September 14, 2009 (Monday), 10:00 a.m.,Rényi Institute: Ervin Győri (CEU and Rényi Institute), Funny numbers, functions and graphs
2009 Sessions
 January 9, 2009 (Friday), 3:00 p.m., Classroom 310/A: Martin Le Doux Mbele Bidima (Second Year PhD Student),Artbitrage and optimal investment in financial markets, plus a short presentation of Cameroon.
 January 16, 2009 (Friday), 3:00 p.m., Classroom 310/A, Zalán Gyenis (First Year PhD Student), Extending Morley's theorem to the finite.
 January 23, 2009 (Friday), 3:00 p.m., Classroom 310/A: Aaron Boikanyo (Second Year PhD Student), Proximal point algorithms for finding zeroes of monotone operators.
 January 30, 2009 (Friday), 3:00 p.m., Renyi Institute: Balázs Keszegh (PhD Candidate), Combinatorial and computational problems about points in the plane (thesis defense).
 February 6, 2009 (Friday), 3:00 p.m., Classroom 310/A: Áron Varga (Third Year PhD Student), From classical Markov chains to quantum Markov triplets.
 February 13, 2009 (Friday), 3:00 p.m., Classroom 310/A: Ferenc Szöllősi (First Year PhD Student), Complex Hadamard matrices.
 February 20, 2009 (Friday), 3:00 p.m., Classroom 310/A: Máté Vizer (First Year PhD Student), Borel equivalence relations; Siarhei Charnyi (First Year MS Student), Solving maximin problems by using nonsmooth optimization methods
 February 27, 2009 (Friday), 3:00 p.m., Classroom 310/A: Mihai Mihăilescu (Second Year PhD Student), Some eigenvalue problems for elliptic partial differential operators
 March 6, 2009 (Friday), 3:00 p.m., Classroom 310/A: Natasa Krejić (Professor, University of Novi Sad, Serbia), Amodel for optimal execution of atomic orders at electronic stock exchanges
 March 13, 2009 (Friday), 3:00 p.m., Classroom 310/A: Cătălin Ghinea (Third Year PhD Student), The central limit theorem
 April 21, 2009 (Tuesday), 5 p.m., Renyi Institute: Zoltan Halasi (PhD Candidate), On the representations of solvable linear groups (thesis defense)
 May 7, 2009 (Thursday), 2:00 p.m., Renyi Institute: Csaba Henk (PhD Candidate), A model theoretic analysis of the ChurchTuring Thesis (thesis defense).
 May 8, 2009 (Friday), 11:00 a.m., Classroom 310/A: Balazs D. Patkos (University of Memphis, TN, USA), Percolation problems in random geometric graphs.
 May 15, 2009 (Friday), 9:00 a.m., Classroom 310/A: Thomas Baier (PhD Candidate), A state estimation scheme for finite quantum systems (thesis defense).
 June 25, 2009 (Thursday), 10:00 a.m., Renyi Institute: Zoltán Szentmiklóssy (PhD Candidate), Resolvability of topological spaces (thesis defense).
 July 8, 2009 (Wednesday), 2:00 p.m., Renyi Institute, Peter Jossen (PhD Candidate), On the arithmetic of 1motives (thesis defense)