Il teorema dell’indice di Poincaré-Hopf…
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Introduction to Legendrian 2-bridge knots – Viktória Földvári (Elte University, Budapest)
On an oriented 3-manifold we can define a contact structure, that is, a completely non-integrable plane field in the tangent bundle of the manifold. Regarding such a structure we consider knots that are everywhere tangent to this plane field. After…