Geodesic
ON METRIC PRESERVING FUNCTIONS AND INFINITE DERIVATIVES
Acta mathematica Universitatis Comenianae, Tome 67 (1998) no. 2 
R. W. Vallin. ON METRIC PRESERVING FUNCTIONS AND INFINITE DERIVATIVES. Acta mathematica Universitatis Comenianae, Tome 67 (1998) no. 2. http://geodesic.mathdoc.fr/item/AMUC_1998_67_2_a9/
@article{AMUC_1998_67_2_a9,
     author = {R. W. Vallin},
     title = {ON {METRIC} {PRESERVING} {FUNCTIONS} {AND} {INFINITE} {DERIVATIVES}},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {1998},
     volume = {67},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_1998_67_2_a9/}
}
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Voir la notice de l'article provenant de la source Comenius University

We give two examples to answer a question of J. Dobos and Z. Piotrowski concerning the points at which a metric preserving function has an infinite derivative.