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A class of vacuum electromagnetic fields in which the field lines are knotted curves are reviewed. The class is obtained from two complex functions at a particular instantt = 0so they inherit the topological properties of red the level curves of these functions. We study the complete topological structure defined by the magnetic and electric field lines att = 0    . This structure is not conserved in time in general, although it is possible to red find special cases in which the field lines are topologically equivalent for every value of t

On the Fibration Defined by the Field Lines of a Knotted Class of Electromagnetic Fields at a Particular Time