Resumen de The set of exponents for isomorphic extensions of Hölder maps is not always closed

Sylvain Delpech

• We give examples of Banach spaces X and Y such that the sets of ® 2 (0; 1], which satisfy that every ®-HÄolder maps from a subset of X into Y can be isomorphically extended to all X, are not closed. This answers a question of Lancien and Randrianantoanina.