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Castelnuovo–Mumford regularity is a notion that measures the complexity of graded ideals and modules. Mumford famously proved that regularity admits a uniform bound in flat families. This tool becomes crucial in that it allows one to construct the Hilbert scheme, parameterizing closed subschemes with fixed Hilbert polynomial. In this talk, I will somehow discuss all of these notions for saturated homogeneous ideals without ever saying the words "ideal sheaf", "proj", or "representable functor".

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