A Wall-Crossing Formula and the Invariance of GLSM Correlation Functions

In this paper, we prove a wall-crossing formula, a crucial ingredient needed to prove that the correlation function of gauged linear σ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sigma $$\end{document}-model is independent of the choice of perturbations.