Talks

1) Inductively closed families in semigroups, the XXIst National Student Conference, Szombathely (Hungary), April 1993.

2) Kompaktifizierungen rechtstopologischer Gruppen und Halbgruppen, the Xth Seminar Sophus Lie, Clausthal (Germany), July 7-8, 1995.

3) Zur Bohr-Kompaktifizierung von Kegeln in fast-abelschen Lie-Gruppen, the XIIIrd Seminar Sophus Lie, Erlangen (Germany), December 6-7, 1996.

4) Diamanten und Regenschirme in der sl(2,R), joint talk with W.A.F. Ruppert at the Erwin Schrödinger International Mathematical Physics Institute, Vienna (Austria), Octomber 25, 1999.

5) Diamonds and umbrellas (joint talk with W.A.F. Ruppert), Seminar Sophus Lie, Stuttgart (Germany, January 7-8, 2000.

6) Aliens in Lie semigroups (joint talk with W.A.F. Ruppert), Seminar Sophus Lie, Greifswald (Germany), June 15-16, 2001.

7) On Lie order structures and aliens (joint talk with W.A.F. Ruppert), Conference of the Mathematical Societies of Austria and Germany, Vienna (Austria), September 16-22, 2001.

8) The Bohr-compactification of subsemigroups of Sl(2,R) (joint talk with W.A.F. Ruppert), Seminar Sophus Lie, Berlin (Germany), December 6-8,2001.

9) News about the Bohr compactification of subsemigroups of SL(2,R) (joint talk with W.A.F. Ruppert), the XXIIIrd Seminar Sophus Lie, Erlangen (Germany), June 20-22, 2002.

10) Despre studiul proprietăţilor asimptotice ale subsemigrupurilor grupurilor Lie, Conferinţa naţională de Analiză Matematică şi Aplicaţii (ediţia a VI-a), Cluj-Napoca, November 8-9, 2002.

11) Compactifications of subsemigroups of Lie groups, 5th Congress of Romanian Mathematicians, Piteşti (România), June 22-28, 2003.

12) Semigroups in Lie groups. A program, Seminar Sophus Lie, Bielefeld (Germany), July 4-5, 2003.

13) On the asymptotic behaviour of subsemigroups of Lie groups, 5th Joint Conference on Mathematics and Computer Science, Debrecen (Hungary), June 9-12, 2004.

14) Lattices of subsemigroups of Lie groups (joint talk with W.A.F. Ruppert), Seminar Sophus Lie, Darmstadt (Germany), January 6-7, 2006.

15) The study of nonlocal properties of subsemigroups of Lie groups, CEU, Budapest (hungary), March 21, 2006.

16) A multiplicity result for systems of hemivariational inequalities and its applications, Seminar Sophus Lie, Viena (Austria), November 3-4, 2006.

17) On Lie semigroup analogues of parabolic Lie groups (joint talk with W.A.F. Ruppert), Seminar Sophus Lie, Darmstadt (Germany), October 5-6, 2007.

18) Semigroups and Lie Theory (joint talk with K.H. Hofmann), Seminar Sophus Lie, Cluj-Napoca, July 4-6, 2008.

19) Infinitely many solutions for the Dirichlet problem on the Sierpinski gasket (joint talk with Cs. Varga), The International Conference of Differential Geometry and Dynamical Systems, Universitatea Politehnică Bucureşti, October 8-11, 2009.

20) On problems involving the weak Laplacian operator on the Sierpinski gasket, (joint talk with Cs. Varga), The 23rd International Conference on Operator Theory, Universitatea de Vest, Timişoara, June 29 – July 4, 2010.

21) On the existence of multiple solutions for the Dirichlet problem on the Sierpinski gasket, (joint talk with Cs. Varga), The 7th edition of the Bolyai-Gauss-Lobachewsky conference series, Universitatea Babeş-Bolyai, Cluj-Napoca, July 5-9, 2010.

22) One-parameter Dirichlet problems, on the Sierpinski gasket, (joint talk with Cs. Varga), ICNODEA, Universitatea Babeş-Bolyai, Cluj-Napoca, July 5-8, 2011.

23) Nonlinear elliptic problems on the Sierpinski gasket, Workshop on Advances in Differential Equations: symmetrizations and related topics,Universitatea Babeş-Bolyai, Cluj-Napoca, 14-15 martie 2013.

24) Parameter-depending problems on fractals, 9thInternational Conference on Applied Mathematics ICAM 9, Baia Mare, Romania, 25-28 septembrie 2013.

25) Nonlinear elliptic problems on the Sierpinski gasket,10thJoint Conference on Mathematics and Computer Science, Cluj-Napoca, Romania, 21-25 mai 2014.

26) Laplace type operators on the Sierpinski fractal, (în colaborare cu R. Chill), 19th ÖMG Congress and annual DMV Meeting, Paris-Lodron-University of Salzburg, Austria, 11-15 septembrie 2017.

27) Properties of harmonic functions on self-similar sets, 12thJoint Conference on Mathematics and Computer Science, Cluj-Napoca, Romania, 14-17 iunie 2018.