Talks & Posters

Peer Reviewed Conference Talks

June 18, 2019 "MEGA 2019", Universidad Complutense de Madrid, Spain.
An Experimental Comparison of SONC and SOS Certificates for Unconstrained Optimization
July 5, 2016 "FPSAC '16", Simon Fraser University, Vancouver, Canada.
Intersections of Amoebas (poster presentation)
June 18, 2015 "MEGA 2015", University of Trento, Italy.
Norms of Roots of Trinomials
June 15, 2015 "MEGA 2015", University of Trento, Italy.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
June 5, 2013 "MEGA 2013", Goethe University, Frankfurt/Main, Germany.
Separating Inequalities for Nonnegative Polynomials that Are not Sums of Squares
May 31, 2011 "MEGA 2011", Stockholm University, Sweden.
Approximation of Amoebas and Coamoebas by Sums of Squares (poster presentation)

Invited Conference Talks

Mar 10, 2022 "Annual Conference of the Fachgruppe Computeralgebra of the DMV" (virtual) Munich, Germany / virtual.
The SONC Cone: Primal and Dual Perspectives.
Sep 20, 2021 Workshop "Numerical and Probabilistic Nonlinear Algebra" Max Planck Institute for Mathematics in the Sciences; Leipzig, Germany.
An Introduction to Nonnegativity and Polynomial Optimization.
Sep 16, 2021 Workshop "POEMA (Polynomial Optimization, Efficiency through Moments and Algebra) ITN Learning Week" (virtual) LAAS-CNRS, Toulouse, France / virtual.
An Introduction to Circuitpolynomials and AM/GM-based Certificates of Nonnegativity.
Aug 16, 2021 Minisymposium "Computational Real Algebraic Geometry" at the 2021 SIAM Conference on Applied Algebraic Geometry (virtual), Texas A&M University, TX, USA / virtual.
Talk cancelled due to COVID-19 vaccination side effects
Mar 21, 2021 Online-Workshop "Computational Algebra 2021" (virtual) Oldenburg, Germany / virtual.
An Introduction to Nonnegativity and Polynomial Optimization.
Mar 14, 2021 AMS special session on "Optimization and Real Algebraic Geometry" at the Spring 2021 Southeastern Sectional Meeting 2021 (online) Georgia Tech, Atlanta, GA, USA.
Certificates of Nonnegativity and Their Applications in Theoretical Computer Science.
Sep 14-17, 2020 Minisymposium "Computeralgebra" at the DMV Jahrestagung, TU Chemnitz, Germany.
Minisymposium cancelled due to COVID-19.
June 15-24, 2020 Workshop "Computational Algebraic Geometry" at the FoCM 2020 Conference, Simon Fraser University, Vancouver, Canada.
Cancelled due to COVID-19.
Oct 8, 2019 "Varieties, Polyhedra, Computation" Opening Conference for the MATH+ Semester on Applied Algebraic Geometry, TU Berlin, Germany.
Discriminants, Nonnegativity, and Tropical Geometry
Sep 27, 2019 Workshop "Discrete Geometry with a View on Symplectic and Tropical Geometry"; Univ. of Cologne, Germany.
Discriminants, Nonnegativity, and Tropical Geometry
Aug 6, 2019 Cluster "Conic, Copositive and Polynomial Optimization" at the ICCOPT 2019 in Berlin, Germany.
New Dependencies of Hierarchies in Polynomial Optimization
July 11, 2019 Minisymposium "Numerical Methods for Structured Polynomial Solving" at the 2019 SIAM Conference on Applied Algebraic Geometry in Bern, Switzerland.
Polyhedral Real Homotopy Continuation
March 20, 2019 Conference "Mathematics of Quantum Information", Siegen, Germany.
New Dependencies of Hierarchies in Polynomial Optimization
Dec 14, 2018 Workshop "Applied Algebraic Geometry", Bristol, UK.
Nondegenerate Multistationarity in Small Reaction Networks
Nov 21, 2018 Session "Semidefinite Optimization and Applications" at the PGMO Days 2018, EDF'Lab Paris-Saclay, France.
An Experimental Comparison of SONC and SOS Certificates for Unconstrained Optimization
Nov 3, 2018 AMS Special Session on "Numerical Methods for Nonlinear Systems", University of Arkansas, Fayetteville, AR, USA.
Polynomial Optimization via SONC Certificates
Oct 19, 2018 Workshop "Real Algebraic Geometry and Optimization", ICERM, Brown University, RI, USA.
An Experimental Comparison of SONC and SOS Certificates for Unconstrained Optimization
Oct 2, 2018 Workshop on "Hot Topics: Shape and Structure of Materials", MSRI, Berkeley, CA, USA.
An Introduction to Computational Algebraic Geometry and Polynomial Optimization
July 12, 2018 Session "Theory of Convex Optimization" at the 2018 SIAM Annual Meeting in Portland, OR, USA.
Optimization over the Boolean Hypercube via Sums of Nonnegative Circuit Polynomials
July 3, 2018 Workshop "Relative Entropy Programming" at the ISMP 2018 in Bordeaux, France.
Optimization over the Hypercube via Sums of Nonnegative Circuit Polynomials
Feb 22, 2018 Workshop "Combinatorics, Polytopes, and Complexity" during the semester programm "Tropical Geometry, Amoebas, and Polytopes", Institut Mittag-Leffler, Djursholm, Sweden.
The Lattice of Amoebas
Nov. 14, 2017 Session "Hierarchies of Certified Convex Programs for Polynomial Systems" at the PGMO Days 2017, EDF'Lab Paris-Saclay, France.
Cancelled due to sickness.
Aug. 4, 2017 Minisymposium "Semidefinite Optimization and Convex Algebraic Geometry" at the 2017 SIAM Conference on Applied Algebraic Geometry, Atlanta, GA.
The Relation between SOS and SONC
July 11, 2017 Workshop "Computational Algebraic Geometry" at FoCM 2017, Barcelona, Spain.
A Positivstellensatz for Sums of Nonnegative Circuit Polynomials
May 22-25, 2017 "2017 SIAM Conference on Optimization", Vancouver, Canada.
Cancelled due to move to Germany
Nov. 14, 2016 "INFORMS Annual Meeting", Nashville, TN.
New Certificates for Nonnegativity via Circuit Polynomials
Nov. 12, 2016 AMS special session on "Applied Algebraic Geometry", NCSU, Raleigh, NC.
New Certificates for Nonnegativity via Nonnegative Circuit Polynomials
May 4, 2016 "Eighth Discrete Geom. and Algebr. Combinatorics Conf.", South Padre Island, TX.
New Certificates for Nonnegativity via Circuit Polynomials and Geometric Programming
April 9, 2016 "Meeting on Algebraic Geometry for Applications", Clemson University, SC.
New Certificates for Nonnegativity via Circuit Polynomials and Geometric Programming
Aug. 4, 2015 "SIAM Conference on Applied Algebraic Geometry", NIMS & KAIST, Deajeon, South Korea.
Roots of Trinomials from the Viewpoint of Amoeba Theory
May 29, 2015 "Workshop on NonLinear Algebra", Academy of Sciences and Humanity, Berlin, Germany.
Computing Amoebas
May 1, 2015 "Tropical Aspects in Geometry, Topology and Physics", MFO, Oberwolfach, Germany.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
June 27, 2014 "Tropical Dibbelabbes", Saarland University, Saarbrücken, Germany.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
Sep. 3, 2013 "Tropical Geometry and Topology", MPI, Bonn, Germany.
Roots of Trinomials from the Viewpoint of Amoeba Theory
July 30, 2011 "4th PhD-students Conference on Tropical Geometry", Technische Universität Kaiserslautern, Germany.
The Configuration Space of Amoebas with Barycentric Simplex Newton Polytope
Oct. 2, 2009 "DMV-Studierendenkonferenz", Ruhr Universität, Bochum, Germany.
Polytopes with Special Simplices
Dec. 11, 2009 "1st PhD-students Conference on Tropical Geometry", Technische Universität Berlin, Germany.
Amoebas of Genus at Most One

Further Conference Talks

Oct. 11, 2019 "Herbstplenum der Jungen Akademie", Katholische Akademie Hamburg, Germany.
Artificial Intelligence in Medicine (poster presentation; joint with I. N. Schellinger)
Oct. 11, 2019 "Herbstplenum der Jungen Akademie", Katholische Akademie Hamburg, Germany.
Identifying Parameter Regions of Monostationarity via SONC (poster presentation)
Sep. 27, 2017 "First annual meeting of the DFG collaborative research center SFB-TRR 195", RWTH Aachen, Germany.
Lopsided Amoeba Approximation
Aug. 2, 2017 "SIAM Conference on Applied Algebraic Geometry", Atlanta, GA.
Current Key Problems on Sums of Nonnegative Circuit Polynomials
June 10, 2017 Workshop "Polynomials and Polytopes", Technische Universität Berlin, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
July 26, 2016 "XXI Coloquio Latinoamericano de Álgebra", Universidad de Buenos Aires, Argentina.
Intersections of Amoebas (poster presentation)
April 2, 2016 "TAGS 2016", University of Texas at Austin, TX.
Intersections of Amoebas (poster presentation)
Jan. 9, 2016 "Joint Mathematics Meeting", Seattle, WA.
Nonnegative Polynomials and Sums of Squares Supported on Circuits
Nov. 7, 2015 "TGTC '15", Rice University, Houston, TX.
Norms of Roots of Trinomials (poster presentation)
Apr. 11, 2015 "TAGS 2015", Texas A&M University, College Station, TX.
Norms of Roots of Trinomials (poster presentation)
March 15, 2014 Annual conference of the DFG priority project SPP 1489 "Algorithmic and experimental methods in algebra, geometry, and number theory", Bad Boll, Germany.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
Sep. 25, 2013 "ÖMG-DMV Congress 2013", University of Innsbruck, Austria.
Roots of Trinomials from the Viewpoint of Amoeba Theory
Sep. 18, 2012 "DMV-Jahrestagung", Saarland University, Saarbrücken, Germany.
Tropical Approaches to Amoebas Supported on a Circuit
April 2, 2012 Workshop "Tropical Geometry", ICMS, Edinburgh, Scotland.
The Configuration Space of Amoebas (poster presentation)
Nov. 12, 2010 "Kolkom 2010", MPI, Saarbrücken, Germany.
Polytopes with Special Simplices

Research Seminar Talks

Oct 07, 2021 Applied Algebra Seminar (online), University of Wisconsin at Madison, Wi, USA..
Certificates of Nonnegativity and Maximal Mediated Sets
March 09, 2021 SIAM SAGA - Seminar on Applied Geometry and Algebra (online), Recurring monthly virtual seminar by the SIAM algebraic geometry activity group..
Certificates of Nonnegativity and Their Applications in Theoretical Computer Science
Jan 21, 2021 Oberseminar Algebraische Geometrie, LUH Hannover, Germany (online).
Nonnegativity, Discriminants, and Tropical Geometry
Sep 08, 2020 Nonlinear Algebra Seminar Online (NASO), MPI Leipzig, Germany (online).
New Dependencies of Hierarchies in Polynomial Optimization
June 11, 2020 Seminar on Combinatorial Aspects of Commutative Algebra and Algebraic Geometry (CACAAG), IITB, Bombay, India (online).
Nonnegativity, Discriminants, and Tropical Geometry
Jan. 09, 2019 Discrete Mathematics and Geometry Seminar, TU Berlin, Berlin, Germany.
Nondegenerate Multistationarity in Small Reaction Networks
Oct. 29, 2018 Industrial & Applied Mathematics Seminar, Texas A&M University, College Station, TX, USA.
An Experimental Comparison of SONC and SOS Certificates for Unconstrained Optimization
Oct. 26, 2018 Valley Geometry Seminar, UMass Amherst, MA, USA.
An Experimental Comparison of SONC and SOS Certificates for Unconstrained Optimization
May 14, 2018 Séminaire Parisien d'Optimisation, Intitut Henri Poincaré, Paris, France.
A New Approach to Nonnegativity and Polynomial Optimization
Nov 29, 2017 Graduiertenkolleg: "Kombinatorische Strukturen in der Geometrie", Universität Osnabrück, Germany.
Discrete Structures Related to Nonnegativity
Nov 20, 2017 Graduiertenkolleg: "Methods for Discrete Structures", Technische Universität Berlin, Germany.
Discrete Structures Related to Nonnegativity
Oct 27, 2017 Oberseminar "Mathematische Optimierung", Otto von Guericke Universität Magdeburg, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
Aug 23, 2017 Discrete Mathematics and Geometry Seminar, Technische Universität Berlin, Germany.
Intersections of Amoebas
July 14, 2017 Applied Mathematic Seminar, Universität Bonn, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
Feb 17, 2017 Geometry Seminar, Texas A&M University, College Station, TX.
Constrained Polynomial Optimization via SONCs and Relative Entropy Programming
Feb 17, 2017 Algebra & Combinatorics Seminar, Texas A&M University, College Station, TX.
A Positivstellensatz for Sums of Nonnegative Circuit Polynomials
Feb 7, 2017 Junior Algebra & Geometry Seminar, Texas A&M University, College Station, TX.
An Introduction to Tropical Geometry
Nov 25, 2016 Discrete Geometry Seminar, Freie Universität Berlin, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
Nov 24, 2016 Discrete and Algorithmic Geometry Seminar, Technische Universität Berlin, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
April 8, 2016 Algebraic Geometry and Number Theory Seminar, Clemson University, SC.
Intersections of Amoebas
March 16, 2016 Algebra Seminar, Universidad de Los Andes, Bogotá, Colombia.
An Introduction to Amoeba Theory and Intersections of Amoebas
Feb. 16, 2016 Junior Algebra & Geometry Seminar, Texas A&M University, College Station, TX.
An Introduction to Tropical Geometry
Feb. 11, 2016 Scientific and Statistical Computing Seminar, University of Chicago, IL.
New Certificates for Nonnegativity via Circuit Polynomials and Geometric Programming
Feb. 4, 2016 FRAGMENT Seminar, Colorado State University, Fort Collins, CO.
An Introduction to Amoeba Theory and Intersections of Amoebas
Feb. 3, 2016 Joint FRAGMENT and Poisson Geometry Seminar, University of Colorado at Boulder, CO.
New Certificates for Nonnegativity via Circuit Polynomials and Geometric Programming
Jan. 29, 2016 Algebra and Combinatorics Seminar, Texas A&M University, College Station, TX.
Intersections of Amoebas
Oct. 6, 2015 Algebra Seminar, Emory University, Atlanta, GA.
Roots of Trinomials from the Viewpoint of Amoeba Theory
Oct. 5, 2015 Algebra Seminar, Georgia Tech, Atlanta, GA.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
Sep. 15, 2015 Algebraic Geometry and Number Theory Seminar, Rice University, Houston, TX.
Nonnegative Polynomials and Sums of Squares Supported on Circuits
June 26, 2015 CAKE Seminar, Universität Osnabrück, Germany.
An Introduction to Amoeba Theory
June 11, 2015 Oberseminar Algebraische Geometrie, Universität Augsburg, Germany.
Roots of Trinomials from the Viewpoint of Amoeba Theory
March 6, 2015 Algebra and Combinatorics Seminar, Texas A&M University, College Station, TX.
A Sharp Upper Bound for the Complexity of Labeled Oriented Trees
Feb. 19, 2015 Number Theory Seminar, University of Texas at Austin, TX.
Nonnegative Polynomials and Sums of Squares Supported on Circuits
Feb. 16, 2015 Geometry Seminar, Texas A&M University, College Station, TX.
The Boundary of Amoebas
Sep. 30, 2014 Student Working Seminar in Discrete Math., Texas A&M University, College Station, TX.
An Introduction to Amoeba Theory
Sep. 29, 2014 Geometry Seminar, Texas A&M University, College Station, TX.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
Sep. 23, 2014 Student Working Seminar in Discrete Math., Texas A&M University, College Station, TX.
An Introduction to Tropical Geometry
June 5, 2014 Discrete Geometry Seminar, Freie Universität Berlin, Germany.
Nonnegative Polynomials and Sums of Squares Supported on Circuits
Jan. 28, 2014 Research Group "Polyhedral Surfaces", Technische Universität Berlin, Germany.
An Introduction to Amoeba Theory
Jan. 28, 2014 AG Diskrete Mathematik, Goethe University, Frankfurt/Main, Germany.
The Boundary of Amoebas
Jan. 15, 2014 Oberseminar: Optimierung, Geometrie und diskrete Math., Universität zu Köln, Germany.
Amoebas, Nonnegative Polynomials and Sums of Squares Supported on Circuits
Dec. 5, 2013 Oberseminar Algebraische Geometrie und Computeralgebra, Saarland University, Saarbrücken, Germany.
The Boundary of Amoebas
July 12, 2013 AG Diskrete Mathematik, Goethe University, Frankfurt/Main, Germany.
Contemporary Key Problems in Amoeba Theory
Oct. 28, 2012 PhD-students seminar, Goethe University, Frankfurt/Main, Germany.
An Introduction to Amoeba Theory
June 27, 2012 AG & Oberseminar Diskrete Mathematik, Goethe University, Frankfurt/Main, Germany.
Roots of Trinomials from the Viewpoint of Amoeba Theory
June 8, 2012 Working group algebra and combinatorics, CWI, Amsterdam, The Netherlands.
Separating Inequalities for Nonnegative Polynomials that Are not Sums of Squares
June 6, 2012 Séminaire de Géométrie Tropicale, Université Pierre et Marie Curie (Paris 6), Paris, France.
Roots of Trinomials from the Viewpoint of Amoeba Theory
May 23, 2012 Oberseminar "Kombinatorik und Algebra", Philipps-Universität, Marburg, Germany.
Roots of Trinomials from the Viewpoint of Amoeba Theory
Feb. 1, 2012 Research Seminar, Université de Genève, Switzerland.
Contemporary Key Problems in Amoeba Theory
July 5, 2011 AG & Oberseminar Diskrete Mathematik, Goethe University, Frankfurt/Main, Germany.
The Configuration Space of Amoebas with Barycentric Simplex Newton Polytope
Nov 27, 2010 Research Seminar, Courant Research Centre, Göttingen, Germany.
(Co)Amoebas: Different Aspects of Approximation, Boundary and Homotopy
Dec. 18, 2009 AG & Oberseminar Diskrete Mathematik, Goethe University, Frankfurt/Main, Germany.
Amoebas of Genus at Most One

Colloquium Talks

Jan 19, 2022 Colloquium, Universität Osnabrück (virtual), Germany.
The SONC Cone: Primal and Dual Perspectives
Nov 06, 2020 Colloquium, Universität des Saarlandes, Germany.
A New Approach to Nonnegativity and its Applications
May 22, 2019 Colloquium, Universität Osnabrück, Germany.
An Introduction to Nonnegativity and Polynomial Optimization
June 26, 2018 Colloquium, TU Kaiserlautern, Germany.
Ein neuer Ansatz zu Nichtnegativität und polynomieller Optimierung
May 24, 2018 Colloquium, Universität Siegen, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
May 3, 2018 Colloquium, Otto von Guericke Universität Magdeburg, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
March 27, 2018 Colloquium, TU Braunschweig, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
Jan. 17, 2018 Colloquium, Universität Trier, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
June 12, 2017 Colloquium, Universität Leipzig, Germany.
A New Approach to Nonnegativity and Polynomial Optimization
Dec. 14, 2016 Colloquium, University of Massachusetts at Amherst, Amherst, MA.
A New Approach to Nonnegativity and Polynomial Optimization
Oct. 5, 2016 Colloquium, Sam Houston State University, Huntsville, TX.
An Introduction to Amoeba Theory
Oct. 19, 2015 Postdoc Colloquium, Texas A&M University, College Station, TX.
Nonnegative Polynomials and Sums of Squares Supported on Circuits
Oct. 9, 2014 Postdoc Colloquium, Texas A&M University, College Station, TX.
Roots of Trinomials from the Viewpoint of Amoeba Theory

Outreach Talks

Feb. 19, 2018 BMS-days, Urania, Berlin, Germany.
An Introduction to Nonnegativity and Polynomial Optimization
May 7, 2016 Math Circle, Texas A&M University, College Station, TX.
Public Key Cryptography
Aug. 8, 2014 Uni Camp 2014, Saarland University, Saarbrücken, Germany.
Public Key Kryptoverfahren
Aug. 8, 2014 Uni Camp 2014, Saarland University, Saarbrücken, Germany.
Mathematik Studieren
Oct. 8, 2009 Math Circle, Goethe University, Frankfurt/Main, Germany.
Das Art Gallery Problem