Geodesic
On Darboux points and the perfectly closed class of functions
Acta Universitatis Lodziensis. Folia Mathematica, Tome 04 (1991).

Voir la notice de l'article provenant de la source University of Lodz Repository

The present paper is intended to discuss problems connected with operations on Darboux functions at some point x0. 
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     author = {Pawlak, Ryszard J.},
     title = {On {Darboux} points and the perfectly closed class of functions},
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Pawlak, Ryszard J. On Darboux points and the perfectly closed class of functions. Acta Universitatis Lodziensis. Folia Mathematica, Tome 04 (1991). http://geodesic.mathdoc.fr/item/AULFM_1991_04_a6/