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Penn Mathematics Colloquium

Wednesday, February 7, 2024 - 3:45pm

Brendan Hassett

Brown University


University of Pennsylvania


Tea will be served at 3:15pm in the Math Lounge, DRL, 4th floor.

Consider smooth projective varieties that are built geometrically using a finite number of affine spaces. Examples include projective spaces and Grassmannians, toric varieties, even-dimensional intersections of two quadrics, and moduli spaces of pointed rational curves. We consider rationality questions over non-closed fields and in the presence of group actions. Even over the real numbers, there are many open problems! (joint with Kollár, Tschinkel, and Zhang)