In this talk, I will review the paper by A. Gadde, S. Gukov, P. Putrov [arXiv:1310.0818]. The discussion will cover the following topics:
* Dynamics of 2d N=(0,2) gauge theories.
* An analogue of Seiberg duality in (0,2) supersymmetric QCD that turns out to be triality.
* Conditions for dynamical supersymmetry breaking.
* (0,2) quiver gauge theories and their "mutations" (if time permits).
