John Christian Ottem (UiO): Effective cycles of higher codimension

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Abstract: While the cones of effective and nef divisors are fundamental objects in algebraic geometry, the corresponding cones for cycles of higher codimension have received much less attention and remain more mysterious. We survey some recent developments in this area. The talk will focus on a few illustrative examples, including the variety of lines on a cubic fourfold.

Published Nov. 21, 2016 1:15 PM - Last modified Mar. 8, 2020 9:15 PM