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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

4 votes
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Universal vector extension of a p-divisible group and the exponential.

Given a coalgebra $U$ with a marked element $1\in U$, define its lie algebra to be the set of primitive elements ($u \in U|\Delta(u) = u \otimes 1 + 1\otimes u$, where $\Delta: U \rightarrow U\otimes …
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