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Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions
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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 …