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We study four-dimensional N=2 supersymmetric pure-gauge (Seiberg-Witten)theory and its N=1 mass perturbation by using compactification S**1 x R**3. Itis well known that on R**4 (or at large S**1) the perturbed theory realizesconfinement through monopole or dyon condensation. At small S**1, wedemonstrate that confinement is induced by a generalization of Polyakov'sthree-dimensional instanton mechanism to a locally four-dimensional theory -the magnetic bion mechanism - which also applies to a large class ofnonsupersymmetric theories. Using a large- vs. small-L Poisson duality, we showthat the two mechanisms of confinement, previously thought to be distinct, arein fact continuously connected.

Seiberg-Witten and "Polyakov-like" magnetic bion confinements are continuously connected