Geodesic
Introducing a topology by an operation of a set-theoretic boundary
Acta Universitatis Lodziensis. Folia Mathematica, Tome 07 (1995).

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

A definition of a topology by a boundary operation is considered. 
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     author = {Ch\k{a}dzy\'nska, Alina and Pustelnik, Miros{\l}aw},
     title = {Introducing a topology by an operation of a set-theoretic boundary},
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Chądzyńska, Alina; Pustelnik, Mirosław. Introducing a topology by an operation of a set-theoretic boundary. Acta Universitatis Lodziensis. Folia Mathematica, Tome 07 (1995). http://geodesic.mathdoc.fr/item/AULFM_1995_07_a0/