Lipschitz retractions in Hadamard spaces via gradient flow semigroups

Miroslav Bacak, Leonid V. Kovalev

Let $X(n),$ for $n\in \mathbb{N},$ be the set of all subsets of a metric space $(X,d)$ of cardinality at most $n.$ The set $X(n)$ equipped with the Hausdorff metric is called a fini…