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Periods and algebraic deRham cohomology
Benjamin Friedrich
It is known that the algebraic \deRham cohomology group $\hDR{i}(X_0/\Q)$ of a nonsingular variety $X_0/\Q$ has the same rank as the rational singular cohomology group $\h^i\sing(\…
math.AG2005
The Dynkin diagrams of rational double points
Benjamin Friedrich
Rational double points are the simplest surface singularities. In this essay we will be mainly concerned with the geometry of the exceptional set corresponding to the resolution of…