transformation that simultaneously replaces the electric field by the magnetic field and replaces by :

In other words, given a pair of electric and magnetic fields that solve Maxwell's equations, it is possible to describe a new physical setup in which these electric and magnetic fields are essentially interchanged, and the new fields will again give a solution of Maxwell's equations. This situation is the most basic manifestation of S-duality in a field theory.

Montonen-Olive duality

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