Local variational principle for partitions of unity
Establish that for every continuous partition of unity Φ on a compact metric space X and continuous self-map T: X → X, the supremum over all T-invariant Borel probability measures of the local metric entropy defined via continuous partitions of unity equals the local topological entropy defined via continuous partitions of unity; that is, determine whether sup_{μ ∈ M(X,T)} h_μ(T, Φ) = h(T, Φ).
References
In this section, we raise two questions, that are still open. For any continuous partition of unity \Phi, is it true that \sup_{\mu \in M(X,T)} h_\mu(T,\Phi) = h(T,\Phi) \text{?}
— Entropy structures with continuous partitions of unity
(2603.29720 - Carrand, 31 Mar 2026) in Section 7 (Open questions)