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math.OC2026
A true single-level reformulation for pessimistic bilevel optimization
Oliver Stein, Alain Zemkoho
We propose a single-level reformulation (SLR) for the pessimistic bilevel optimization problem that does not rely on complementarity conditions or optimal value functions. For this…
math.OC2026
A single loop method for quadratic minmax optimization
Stefano Cipolla, Oliver Stein, Alain Zemkoho
We consider a quadratic minmax problem with coupled inner constraints and propose a method to compute a class of stationary points. To motivate the need to compute such stationary…
math.OC2019★ 2 cited
An Adaptive Sample Size Trust-Region Method for Finite-Sum Minimization
Robert Mohr, Oliver Stein
We propose a trust-region method for finite-sum minimization with an adaptive sample size adjustment technique, which is practical in the sense that it leads to a globally converge…