Daniel Tubbenhauer: Three colors suffice

A late 20th birthday-present for Lewis Carroll. This is a talk he gave a few days ago at USC. The Temperley-Lieb algebra gives an amazing constructive proof which actually counts 3-colorings. It's an evaluation/reduction process. They were doing this the same year John Reynolds gave his tutorial “the application of the lambda calculus to programming languages”. See Definitional Interpreters Revisted.

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