Two of the early exciting observations about ☐ = 1 SUSY gauge theories were the absence of quadratic loop corrections to scalar masses and the absence of renormalization for many superpotentials. While the former property was an obvious consequence of Bose-Fermi symmetry, the latter follows from holomorphy, which is the focus of this chapter. Topics covered include non-renormalization theorems, wavefunction renormalization, holomorphic gauge coupling, and gaugino condensation. This chapter finishes with more exercises.
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