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I have studied Mathematics at Leiden University. My subject was: Singularities of Plane Algebraic Complex Curves and Knot Theory. Since then my interests has grown from analytic combinatorics, set theory to 4-dimensional topology.
Right now I am studying 4-dimensional topology (Gompf, Stipsicz, Scopan), but I am also interested in exotic spheres and higher dimensional topology.
I am a regular visitor and poster of math.stackexchange