Henry Segerman presents talk titled "How to make sculptures of four-dimensional things."

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The Department of Mathematics and the Ronneburg Lecture Series welcome Dr. Henry Segerman from Oklahoma State Stillwater presenting a talk titled “How to make sculptures of four-dimensional things.” Our brains have evolved in a three-dimensional environment, and so we are very good at visualizing two- and three-dimensional objects. But what about four-dimensional objects? The best we can really do is to look at three-dimensional “shadows”. Just as a shadow of a three-dimensional object squishes it into the two-dimensional plane, we can squish a four-dimensional shape into three-dimensional space, where we can then make a sculpture of it. If the four-dimensional object isn’t too complicated and we choose a good way to squish it, then we can get a very good sense of what it is like. We will explore the sphere in four-dimensional space, the four-dimensional polytopes (which are the four-dimensional versions of the three- dimensional polyhedra), and various sculptures, puzzles, and virtual reality experiences that have come from thinking about these things.

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