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We study the holomorphic twist of 3d ${\cal N}=2$ gauge theories in thepresence of boundaries, and the algebraic structure of bulk and boundary localoperators. In the holomorphic twist, both bulk and boundary local operatorsform chiral algebras (\emph{a.k.a.} vertex operator algebras). The bulk algebrais commutative, endowed with a shifted Poisson bracket and a "higher" stresstensor; while the boundary algebra is a module for the bulk, may not becommutative, and may or may not have a stress tensor. We explicitly constructbulk and boundary algebras for free theories and Landau-Ginzburg models. Weconstruct boundary algebras for gauge theories with matter and/or Chern-Simonscouplings, leaving a full description of bulk algebras to future work. Webriefly discuss the presence of higher A-infinity like structures.

Boundary Chiral Algebras and Holomorphic Twists