Recent and not-so-recent public talks by Ross Willard

• Association for Symbolic Logic (ASL) N. American annual meeting (Ames, May 2024), "The Constraint Satisfaction Problem Dichotomy Theorem" (tutorial), lecture 1 (975 KB), lecture 2 (423 KB), lecture 3 (1.4 MB).
• Panglobal Algebra and Logic Seminar (Colorado, February 2022), "Characterizing [α,β]=0 using Kiss terms," slides (pdf) (1.8 MB).
• Panglobal Algebra and Logic Seminar (Colorado, April 2021), "Inherently nonfinitely based nonassociative algebras," slides (pdf) (213 KB).
• Mathematics and Statistics Colloquium (Missouri S&T, February 2021), "Universal algebra at a crossroads," slides (pdf) (11.5 MB).
• Second Algebra Week (June 2019, Siena), "New algebraic insights from the solutions to the dichotomy conjecture," slides (pdf) (548 KB).
• AAA98 (June 2019, Dresden), "Similarity, critical relations, and Zhuk's bridges," slides (pdf) (10.8 MB).
• BLAST 2019 (May 2019, Boulder, CO), "The constraint satisfaction dichotomy theorem for beginners" (tutorial), Part 1 (pdf) (11 MB), Part 2 (pdf) (1.7 MB), Part 3 (pdf) (1.7 MB).
• Algebras and Lattices in Hawai'i (May 2018, U. Hawai'i at Manoa), "Independence of multi-term commutators and centralizers," slides (pdf) (8.5 MB).
• BLAST 2017 (August 2017, Nashville, TN), "The finite basis problem, Jónsson's speculation, and weird algebras" (tutorial), Part 1, Part 2 (pdf).
• AMS Spring Southeastern Sectional Meeting (March 2017, Charleston, SC), "My favourite open problems in universal algebra," slides (pdf) .
• AMS Fall Western Sectional Meeting (October 2016, Denver, CO), "Series-parallel posets having a near-unanimity polymorphism," slides (pdf) .
• Logic Colloquium 2016 (August 2016, Leeds, UK), "The decidable discriminator variety problem," slides (pdf) .
• Algebra and Computation (May 2016, Boulder, CO), "Constraint Satisfaction Problems: a Survey" (with corrections), slides (pdf) .
• The Constraint Satisfaction Problem: Complexity and Approximability (July 2015, Dagstuhl), "Maltsev constraints revisited," slides (pdf) .
• Open Problems in Universal Algebra (Nashville, May 2015), "Maltsev constraints," slides (pdf) .
• SSAOS 2014 (September 2014, Stará Lesná, Slovakia), "Constraints in universal algebra" (3 lectures), slides (pdf), lecture 1, lecture 2, lecture 3.
• AAA87 (February 2014, Linz, Austria), "The finite basis problem revisited," slides (pdf) .
• AMS Fall Southeastern Sectional Meeting (October 2013, Louisville, KY), "Varieties with a difference term and Jónsson's problem," slides (pdf) .
• GAIA 2013 (July 2013, Melbourne, Australia), "Varieties with a difference term and Park's conjecture," slides (pdf) .
• NSAC 2013 (June 2013, Novi Sad, Serbia), "Graphs, polymorphisms, and multi-sorted structures," slides (pdf).
• AMS Spring Western Sectional Meeting (April 2013, Boulder, CO), "Bipartite graphs and their idempotent polymorphisms," slides (pdf).
• Mathematics seminar (April 2013, Prince George, BC), "Groups in action: or, how to count (mod symmetry)," slides (pdf).
• The Constraint Satisfaction Problem: Complexity and Approximability (November 2012, Dagstuhl), "A tutorial on algebra and CSP, Part 2," slides (pdf).
• LICS 2012 (June 2012, Dubrovnik), "Near unanimity constraints have bounded pathwidth duality," slides (pdf) (146 KB).
• Universal Algebra and Lattice Theory (June 2012, Szeged), "Proving inconsistency: towards a better Maltsev CSP algorithm," slides (pdf).
• AMS sectional meeting (March 2012, Honolulu), "Meditation on Isaev's algebra," slides (pdf) (191 KB).
• Fields Summer School, "Universal algebra for CSP," Lecture 1 slides, Lecture 2 slides.
• OAL2.0 (June 2011, Krakow), "Relational structures, Maltsev conditions, and CSP," slides (pdf) (229 KB).
• AMS sectional meeting (March 2011, Iowa City), "A new property of finite NU(4) algebras" (with M. Kozik), slides (pdf) (172 KB).
• CP 2010 (St. Andrews, Scotland), "Testing expressibility is hard," slides (pdf) (229 KB).
• BLAST 2010 Tutorial lecture 1 (pdf) (200 KB), lecture 2 (pdf) (204 KB).
• Summer School on Algebra and Ordered Sets (Trest, Czech Republic, 2008), "Universal Algebra and Computational Complexity," a tutorial: slides 1 (pdf) (292 KB); slides 2 (pdf) (308 KB); slides 3 (pdf) (352 KB).
• Workshop on Universal Algebra and the Constraint Satisfaction Problem (Nashville, 2007), "Quick course in universal algebra and tame congruence theory," slides (pdf) (232 KB).
• Order, Algebra, and Logics (Nashville, 2007), "Four unsolved problems in congruence permutable varieties," slides (pdf) (188 KB).