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We study two cases of interrelations between enhancement of symmetries in theinfra red (IR) and duality properties of supersymmetric quantum field theoriesin four dimensions. First we discuss an SU(2) N=1 model with four flavors,singlet fields, and a superpotential. We show that this model flows to aconformal field theory with E_6\times U(1) global symmetry. The enhancement ofthe flavor symmetry follows from Seiberg duality. The second example isconcerned with an SU(4) gauge theory with matter in the fundamental andantisymmetric representations. We argue that this model has enhanced SO(12)symmetry in the IR, and then guided by this enhancement, we deduce a new IRduality.

Between symmetry and duality in supersymmetric QFT