Geodesic
The set of exponents for isomorphic extensions of Hölder maps is not always closed.
Extracta mathematicae, Tome 23 (2008) no. 2.

Voir la notice de l'article provenant de la source Proyecto DML-E: Biblioteca Digital de Matemáticas 

@article{EXMATH_2008_2008_1_a10,
     author = {Delpech,  S. },
     title = {The set of exponents for isomorphic extensions of {H\"older} maps is not always closed.},
     journal = {Extracta mathematicae},
     pages = {131-137},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_2008_2008_1_a10/}
}
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Delpech,  S. . The set of exponents for isomorphic extensions of Hölder maps is not always closed.. Extracta mathematicae, Tome 23 (2008) no. 2. http://geodesic.mathdoc.fr/item/EXMATH_2008_2008_1_a10/