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Weifeng Yang

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#machine learning Preprint Sep 2026

Generalized Geometry Block Proximal Linearized Method for Multiblock Nonconvex and Nonsmooth Optimization

This paper considers a class of multiblock nonconvex and nonsmooth optimization problems arising in many applications. Existing methods construct proximal linearized operators or their variants within standard Euclidean geometry to solve this class of problems, forcing their block variable updates to rely on the standa...

Wei-Feng Yang · 0 citations
#machine learning Preprint Sep 2026

Nonmaximal sums of maximally monotone operators under Rockafellar's constraint qualification

We construct counterexamples to Rockafellar's sum conjecture in which two maximally monotone operators satisfy the interior-domain condition but their sum is not maximally monotone, thereby providing the complete disproof of the conjecture. We establish a general construction theorem that computes the entire monotone p...

Wei-Feng Yang · 1 citation
Preprint Aug 2026

An Inertial Block Proximal Linearized Method with Adaptive Momentum for Nonconvex and Nonsmooth Optimization

It is proved that the inertial block proximal linearized method with two-phase adaptive momentum ensures the monotonic convergence of the objective function of this class of problems, and it is proved that the sequence generated by the method globally converges to a critical point.

Wei-Feng Yang · 0 citations
Preprint Aug 2026

Sharp Lower Bounds on the Haraux Function Beyond Reflexivity

We prove that the sharp $\frac{1}{2}$ lower bound for the Haraux function holds for every maximally monotone operator of type~(NI) on an arbitrary real Banach space. This extends the result established in reflexive Banach spaces to arbitrary real Banach spaces. We also establish an exact decomposition at each graph poi...

Wei-Feng Yang · 0 citations

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