Corrigendum and addendum to “Moduli spaces of framed symplectic and orthogonal bundles on P2 and the K-theoretic Nekrasov partition functions” [J. Geom. Phys. 106 (2016) 284–304

Abstract

We give a scheme-theoretic description of μ − 1 ( 0 ) and μ − 1 ( 0 ) / / Sp ( 2 ) , where μ is the moment map defining the space of ADHM data associated to framed SO ( 3 , R ) -instantons with instanton number 1 . The irreducible component in μ − 1 ( 0 ) / / Sp ( 2 ) , other than the Zariski closure of the instanton moduli space, is non-reduced, which is a corrigendum to [Choy (2016), Theorem 4.3]. We further describe this component using the factorization property Braverman et al. (2006).