Ein Beitrag zur Lipschitz-Saturation im unendlichdimensionalen Fall Hans-Jörg Reiffen, Heinz Trapp (1981) Studia Mathematica
Equivalence and zero sets of certain maps in infinite dimensions Michal Fečkan (1993) Commentationes Mathematicae Universitatis Carolinae Equivalence and zero sets of certain maps on infinite dimensional spaces are studied using an approach similar to the deformation lemma from the singularity theory.