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Virtual Symmetries S. Galkin Department of Mathematics, National Research University "Higher School of Economics" |
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Abstract: Sometimes in algebraic geometry there are situations when a group may not act on a space for some trivial reasons, but many of its subgroups can actually act, and moreover one can construct some structures and invariants that would follow from an action of a full group if it would exist. I will discuss a couple of concrete examples and possible explanations of this phenomenon. |
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