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In the first part of this two-paper series (Strahl et al. Constructing tight quadratic relaxations for global optimization: I. Outer-approximating twice-differentiable convex functions. Forthcoming, (2024)), we developed a cutting-plane algorithm to construct convex quadratic underestimators for twice-differentiable convex functions, which we extend here to address the case of non-convex difference-of-convex (d.c.) functions as well. Furthermore, we generalize our approach to consider a hierarchy of quadratic forms, thereby allowing the construction of even tighter underestimators. Utilizing a benchmark library of d.c. functions, we demonstrate noteworthy reduction in the hypervolume between our quadratic underestimators and linear ones constructed at the same points. Additionally, we construct convex QCQP relaxations at the root node of a spatial branch-and-bound tree for a set of systematically created d.c. optimization problems in up to four dimensions, and we show that our relaxations reduce the gap between the lower bound computed by the state-of-the-art global optimization solver BARON and the optimal solution by an excess of 90%, on average.<\/jats:p>","DOI":"10.1007\/s10898-025-01567-5","type":"journal-article","created":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T04:45:53Z","timestamp":1765428353000},"page":"953-987","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Constructing tight quadratic relaxations for global optimization: II. underestimating difference-of-convex (D.C.) functions"],"prefix":"10.1007","volume":"93","author":[{"given":"William R.","family":"Strahl","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arvind U.","family":"Raghunathan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nikolaos V.","family":"Sahinidis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5779-2510","authenticated-orcid":false,"given":"Chrysanthos E.","family":"Gounaris","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,12,11]]},"reference":[{"key":"1567_CR1","doi-asserted-by":"crossref","unstructured":"Adjiman, C. 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