Author

O. Stein

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Preprint Sep 2026

A true single-level reformulation for pessimistic bilevel optimization

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 reason, we refer to it as a true single-level reformulation (tSLR). A remarkable consequence is that this reformulation can satisfy the cla...

O. Stein, Alain B. Zemkoho · 1 citation

Preprint Aug 2026

A single loop method for quadratic minmax optimization

This work considers a quadratic minmax problem with coupled inner constraints and proposes a method to compute a class of stationary points and shows in particular that the method is polynomial in the special case where the inner feasible set of the authors' constrained minmax problem is independent from outer variable...

Stefano Cipolla, O. Stein, Alain B. Zemkoho · 1 citation