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The Joy of Why

What Is the Positive Grassmannian and Why Does It Show Up Everywhere?

June 25, 202651 min

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What links certain mathematical models of traffic flow, shallow-water waves, and quantum particle scattering? The surprising answer lies in a corner of the algebraic combinatorics world that goes by the name of positive Grassmannian. In simple terms, the positive Grassmannian is a shape that classifies other shapes.

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