Description
I will discuss boundary conditions for N=2 SYM in four dimensions. Under RG flow, each b.c. for the UV Lagrangian flows to some boundary in the IR Seiberg-Witten effective theory. For Dirichlet boundary conditions, we propose that the IR boundary is described by an interacting 3d CFT which admits a 3d UV Lagrangian description. I will discuss some checks and consequences of this proposal.