Conference talks

• On homological classification of monoids by properties of cofree acts, Prague, conference "Semigroups and their applications", 1.07-5.07.1996.
• On homological classification of monoids by properties of cofree acts, Tartu, conference "Transformation semigroups and acts over monoids", 16.08.-19.08.1996.
• On a generalization of strong flatness (in Estonian), Tartu, conference "Methods of algebra and analysis", 20.11.-21.11.1998. (Talk was actually given by Mati Kilp.)
• Generalizations of pullback flatness, Braga, International conference on semigroups, 18.06.-23.06.1999. (Joint talk with Sydney Bulman-Fleming and Mati Kilp.)
• When pullback preservation implies equalizer preservation, Postdam,  15th Conference for Young Algebraists and 59 th Workshop on General Algebra, 4.02.-6.02.2000.
• Set-valued functors are equivalent to category actions, Kääriku, Workshop "Algebra and its applications", 11.05.-13.05.2001.
• On commutation of colimits and limits, Kääriku, Workshop "Algebra and its applications", 27.04-28.04.2002.
• On wreath products of set-valued functors, Kääriku, Workshop "Algebra and its applications", 16.05-18.05.2003.
• Wreath products of set-valued functors and tensor multiplication, Kokõ, Theory days of computer science, 30.01-1.02.2004.
• On properties of Morita equivalent monoids, Kääriku, Workshop "Algebra and its applications", 8.05-9.05.2004.
• Limit preservation properties of the greatest semilattice image functor, Nelijärve, Workshop "Algebra and its applications", 7.05-8.05.2005.
• Limit preservation properties of the greatest semilattice image functor, Lisboa, International conference on semigroups and languages, 12.07-15.07.2005.
• Morita equivalence of partially ordered monoids, Kokõ, Workshop "Algebra and its applications", 5.05-7.05.2006.
• Generators in the category of S-posets, Ratnieki, Latvia, Workshop on algebra and its applications, 4.05-6.05.2007.
• Generators in the category of S-posets, Tampere, Finland, 74th Workshop on General Algebra, 7.06-10.06.2007.
• Morita equivalence of partially ordered monoids, Tartu, Conference on Semigroups, Acts and Categories with Applications to Graphs, 27.06-30.06.2007.
• Morita equivalence of partially ordered monoids, York, Sixtieth British Mathematical Colloquium, 25.03-28.03.2008.
• Morita contexts for pomonoids, Viinistu, Workshop "Algebra and its applications", 2.05-4.05.2008.
• Ülevaade uurimustest algebras (2004-2008), Tartu, Algebra ja analüüsi meetodid VII, 20.11-21.11.2008.
• Tensor products and preservation of weighted limits for S-posets, St. Andrews, The Second Meeting of the North British Semigroups and Applications Network, 16.04-17.04.2009.
• Congruences of Morita equivalent categories, Vadsa, Workshop "Algebra and its applications", 25.04-26.04.2009.
• Morita equivalence of semigroups, Tartu, The Third Finnish-Estonian Mathematical Colloquium FinEst Math 2009, 26.08-28.08.2009.
• Morita equivalence of semigroups, Kääriku, Workshop "Algebra and its applications", 30.04-2.05.2010.
• Acceptable Morita contexts for semigroups, Svente, Latvia, Workshop "Algebra and its applications", 29.04-1.05.2011.
• Morita equivalence of semigroups, Luhansk, Ukraine, The 8th International Algebraic Conference in Ukraine, 5.07.-12.07.2011.
• Congruences of strongly Morita equivalent posemigroups, Sokka, workshop "Algebra and its applications", 27.-29.04.2012. (Talk was based on joint research with Tanel Tärgla.)
• Monomorphisms and epimorphisms in varieties of ordered algebras, Väiko-Härmä, workshop "Algebra and its applications", 26.-28.04.2013. (Talk was based on joint research with Nasir Sohail.)
• On congruence extension property for ordered algebras, Tartu, conference "Kangro 100. Methods of Analysis and Algebra", 1.-6.09.2013. (Talk was based on joint research with Nasir Sohail.)
• Congruence extension property for ordered algebras, York, UK, The 16th NBSAN Meeting, 20.11.2013. (Talk was based on joint research with Nasir Sohail and Lauri Tart.)
• On injective hulls of S-posets, Linz, Austria, The 87th Workshop on General Algebra, 07.-09.02.2014. (Talk was based on joint research with Xia Zhang.)
• Injective hulls for posemigroups, Änkküla, workshop "Algebra and its applications", 25.-27.04.2014. (Talk was based on joint research with Xia Zhang.)
• Fair semigroups, Taevaskoja, workshop "Algebra and its applications", 05.-07.05.2017. (Talk was based on joint research with László Márki.)
• Fair semigroups, Novi Sad, Serbia, The 94th Workshop on General Algebra, in conjunction with the 5th Novi Sad Algebraic Conference, 15.-18.06.2017. (Talk was based on joint research with László Márki.)
• Monomorphisms in categories of firm acts, Berlin, Germany, International Workshop on Graphs, Semigroups and Semigroup Acts, 10.-13.10.2017. (Talk was based on joint research with Ülo Reimaa.)
• Morita equivalence for factorizable semigroups, York, UK, The 27th NBSAN Meeting, 07.-08.01.2018. (Talk was based on joint research with Ülo Reimaa.)
• Monomorphisms in categories of acts over semigroups, Tartu, Estonia, International Conference on Algebra and its Applications, 18.-20.07.2018. (Talk was based on joint research with Ülo Reimaa.)
• U-fair semigroups, Cremona, Italy, Semigroups and Groups, Automata, Logics (SandGAL 2019), 10.-13.06.2019. (Talk was based on joint research with Ülo Reimaa and Lauri Tart.)
• Morita equivalence of finite semigroups, Bushehr, Iran, The 27th Iranian Algebra Seminar, 09.-10.03.2022, invited talk. (Talk was based on joint research with Ülo Reimaa and Lauri Tart.)
• Injective hulls and completions of ordered algebras, Szeged, Hungary, The 102nd Workshop on General Algebra (AAA102), 24.-26.06.2022. (Talk was based on joint research with Xia Zhang, Jianjun Feng and Ülo Reimaa.)
• On the semigroup of 2x2 matrices over a linearly ordered abelian group, Tartu, Estonia, The 103rd Workshop on General Algebra (AAA103), 09.-11.06.2023. (Talk was based on joint research with Marilyn Kutti.)
• Tensor product globalization of partial semigroup actions, Pocinho, Portugal, The Conference on Theoretical and Computational Algebra (TCA2023), 02.-07.07.2023. (Talk was based on joint research with Ganna Kudryavtseva.)
• Enlargements and Morita contexts for rings with involution, Olomouc, Czech Republic, The 106th Workshop on General Algebra (AAA106), 07.-09.02.2025. (Talk was based on joint research with Kristo Väljako.)

Other talks

• On Birch and Swinnerton-Dyer problem, Tartu, Millennium problem meeting of Estonian Mathematical Society, 23.03.2001.
• On commutation of colimits and limits, Toronto, category theory seminar of the University of York, 11.10.2002.
• Wreath product of set-valued functors and tensor multiplication, Budapest, algebra seminar of the Alfred Renyi Institute of Mathematics, 22.09.2003.
• On acts over monoids, Budapest, Department of Mathematics and its Applications of the Central European University, public lecture, 23.09.2003.
• Govorov-Lazard theorem for S-posets, Szeged, Bolyai Institute at the University of Szeged, seminar of algebra, 29.10.2003. (Talk was based on the joint research with S. Bulman-Fleming.)
• Govorov-Lazard theorem for S-posets, Linz, Department of Algebra of the Johannes Kepler University Linz, seminar of algebra, 1.12.2003. (Talk was based on the joint research with S. Bulman-Fleming.)
• Morita equivalence of partially ordered monoids, Budapest, algebra seminar of the Alfred Renyi Institute of Mathematics, 12.12.2005.
• Congruences of strongly Morita equivalent posemigroups, Eger, mathematics seminar of the Esterhazy Karoly College, 7.12.2011. (Talk was based on the joint research with Tanel Tärgla.)
• On ordered algebraic structures, inauguration lecture, University of Tartu, 13.04.2016. (slides in Estonian)
• Morita theory of semigroups, Budapest, algebra seminar of the Alfred Renyi Institute of Mathematics, 30.09.2019. (Talk was based on joint research with László Márki and Ülo Reimaa.)
• Morita theory for semigroups II, Murcia, algebra seminar of the University of Murcia, 14.11.2019. (Talk was based on joint research with László Márki and Ülo Reimaa.)
• Morita equivalence of finite semigroups, online seminar on semigroups, automata and languages, University of Porto, 18.06.2021. (Talk was based on joint research with Ülo Reimaa and Lauri Tart.)
• Morita equivalence of semigroups, seminar of algebra and functional analysis, University of Ljubljana, 26.08.2021. (Talk was based on joint research with Ülo Reimaa and Lauri Tart.)
• Algebrast Eestis aastatel 2019-2023, professor Gunnar Kangro 110. sünniaastapäevale pühendatud mälestuskonverents „Algebra ja analüüsi meetodid. X“, Tartu Ülikool, 8.12.2023.