Donald Knuth's Annual Christmas Tree Lecture: Planar Graphs and Ternary Trees
Professor Knuth presents his 19th Annual Christmas Tree Lecture, "Planar Graphs and Ternary Trees." In this lecture, Professor Knuth discusses the beautiful connections between certain trees with three-way branching and graphs that can be drawn in the plane without crossing edges.
nice use of purple in this shot :)
my 23 year old children rates this notification very fun!
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