Mathematical analysis demonstrates that regular cyclically quasi-monotone maps correspond to normal cone operators of quasi-convex functions, indicating applications to optimal transport.
We study the connection between cyclic quasi-monotonicity and quasi-convexity, focusing on whether every cyclically quasi-monotone (possibly multi-valued) map is included in the normal cone operator of a quasi-convex function, in analogy with Rockafellar's theorem for convex functions. We provide a positive answer for locally Lipschitz, non-vanishing maps in any dimension, as well as for general multi-maps in dimension 1. We further discuss connections to revealed preference theory in economics and to L ∞ optimal transport. Finally, we present explicit constructions and examples, highlighting the main challenges that arise in the general case.
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Pascale et al. (2026) studied this question.
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