# Talks

This is a list of outside seminars and talks I have given at various conferences and workshops. For some of them have slides I have included slides and or notes.

## Recent talks

*Cubes in Picard groupoids, MacLane’s \(Q\)-construction, determinants*

Category Theory Octoberfest 2022, University of Ottawa, October 29–39, 2022 (Online)

notes*New invariants for algebraic cycles.*Department of Mathematics, University of Toledo (OH). Jan 21, 2021.

Invited colloquium talk.

slidesWorkshop on categorical groups.

*Leading lecture.*AMS Fall Southeastern Meeting, Oct 10–11, 2020.*Categorical groups, their morphisms, and higher algebraic structures.*

AMS Fall Southeastern Meeting, Oct 10–11, 2020.

slides*Cup products, the Heisenberg group, and codimension two algebraic cycles.*

Geometry Seminar, International School for Advanced Studies (SISSA), Trieste, Italy. Jan. 23, 2018.*Biextensions of stable modules and presentations of bimonoidal categories.*

Invited talk at the Lloyd Roeling Topology Conference—Lloyd Roeling Mathematics Conference at the University of Louisiana at Lafayette, 2017 Nov. 11, 2017.*Biextensions, ring-like stacks, and their classification.*Category Theory Octoberfest 2017, Carnegie Mellon University, Oct. 28, 2017.

slides*Stacks and Homotopy Types: Intersections and Applications.*FSU Mathematics Department colloquium talk. Apr. 21, 2017.*Cohomology of associative algebras, categorical rings, and their morphisms.*Dept. of Mathematical Sciences, West Point USMA. Apr. 27, 2016.*Intersection theory and homotopy types with algebraic structure.*FSU Mathematics Department colloquium talk. Nov. 18, 2015.

slides*Butterflies and morphisms of monoidal and bimonoidal stacks.*Category Theory Octoberfest 2015, University of Ottawa, Nov. 1, 2015.

slides*Arithmetic aspects of Liouville,*Aspects of gauge and string theories: A conference in honour of the 70th birthday of Loriano Bonora, International School for Advanced Studies (SISSA) Trieste, Italy. Jul. 2nd, 2015.

slides*Nonabelian biextensions and bimonoidal functors.*Dept. of Mathematics, University of Maryland. Algebra and Number Theory Seminar. May 11, 2015.*Generating very large numbers.*Outreach talk, Math Fun Day 2014, FSU

slides

example number (*Very large file!*~100MB)*Biextensions, biadditive morphisms, and categorical rings,*Séminaire de théorie des Catégories, Université catholique de Louvain, Louvain-la-Neuve, Belgium. May 16, 2014.*Biextensions and biadditive morphisms,*Algebra and Algebraic Geometry Seminar, Università di Torino, Turin, Italy. May 7, 2014.*Biextensions and biadditive morphisms,*Geometry Seminar, International School for Advanced Studies (SISSA), Trieste, Italy. Apr. 10, 2014.*Biextensions and biadditive morphisms,*Università di Milano, Milan, Italy. Mar. 31st, 2014.*Postnikov invariants and morphisms of monoidal and bimonoidal stacks.*Geometry Seminar, International School for Advanced Studies (SISSA), Trieste, Italy. Jul. 8, 2013.*Butterflies and morphisms of monoidal and bimonoidal stacks.*Category Theory Seminar. Università di Milano, Milan, Italy. Jun. 24, 2013.

slides*Butterflies and morphisms of monoidal and bimonoidal stacks.*Category Theory ‘’Octoberfest’’, Concordia & McGill Universities, Montreal, Canada. Oct. 26, 2012.*Exact sequences and fibrations of classifying stacks.*Geometry Seminar, International School for Advanced Studies (SISSA), Trieste, Italy. Jul. 14, 2011.*Introduction to nonabelian cohomology towards nonabelian A- and B-fields.*4th Workshop on Geometric Methods in Theoretical Physics, International School for Advanced Studies (SISSA), Trieste, Italy. Jul. 12, 2011.*Mapping spaces of group-like stacks.*Algebraic Analysis and Geometry, Padua, Italy. Conference on ‘’Algebraic Analysis and Geometry, 2011.’’ Jul. 4, 2011.*Mapping spaces of group-like stacks*Topology Seminar, Dept. of Mathematics, UC Riverside. Apr. 19, 2011.

slides*Cohomology for stacks and gerbes.*3rd Workshop on Geometric Methods in Theoretical Physics. International School for Advanced Studies. Trieste, Italy. Jul. 9, 2010.*Stacks and non-abelian cohomology.*International School for Advanced Studies, Trieste, Italy. Jun. 19, 2010.*Stacks and non-abelian cohomology.*Program on Derived Algebraic Geometry, Department of Mathematics, University of Salamanca, Spain. Oct. 29, 2009.*Group-like stacks and the non-abelian derived category.*Algebraic Geometry Seminar, International School for Advanced Studies, Trieste, Italy, July 8, 2008.*Liouville action, 2-gerbes, and the determinant of cohomology,*The manifold geometries of quantum field theory Max Planck Institute for Mathematics, Bonn (Germany), June 30-July 4, 2008*Butterflies, morphisms between gr-stacks, and non-abelian cohomology*. Workshop on Categorical Groups, Barcelona, June 16–20, 2008.