Abstract:

I will introduce a framework to account for the ambiguity of stable birational types of a sequence of centers for birational transformations. I will explain in which settings the introduced invariants are nonvanishing, and give applications to the structure of Cremona groups over various fields (based on joint work in progress with H.-Y. Lin and S. Zimmermann).

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https://us02web.zoom.us/j/89452171719?pwd=OWpRc084Z0toYlE3Ym54clF0dXk3UT09