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We consider 3d N=2 non-abelian Hanany-Witten brane setups with chiral flavorsymmetry. We propose that the associated field theories are quivers withimproved bifundamentals, instead of standard bifundamentals. The improvedbifundamental is a strongly coupled SCFT that carries one more U(1) globalsymmetry than the standard bifundamental. As a consequence, our proposalovercomes the long standing challenge of associating to each N=2 brane setup agauge theory with the full rank global symmetry, allowing the study of all theusual supersymmetric observables, such as superconformal index, spherepartition function, chiral ring and moduli space. The construction passes manynon-trivial tests, for instance we algorithmically prove that any two improvedquivers associated to S-dual brane setups are infrared dual. The 3d N=2 mirrordualities can be uplifted to 4d dualities with 4d improved bifundamentalsconnecting USp(2N) nodes.

Mirror dualities with four supercharges