Geodesic
On the existence and closure of sets of characteristic functions
Mathematische Annalen, Tome 86 (1922), pp. 14-17.

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@article{MAN_1922__86_158933,
     author = {O.D. Kellog},
     title = {On the existence and closure of sets of characteristic functions},
     journal = {Mathematische Annalen},
     pages = {14--17},
     publisher = {mathdoc},
     volume = {86},
     year = {1922},
     url = {http://geodesic.mathdoc.fr/item/MAN_1922__86_158933/}
}
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%0 Journal Article
%A O.D. Kellog
%T On the existence and closure of sets of characteristic functions
%J Mathematische Annalen
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%I mathdoc
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O.D. Kellog. On the existence and closure of sets of characteristic functions. Mathematische Annalen, Tome 86 (1922), pp. 14-17. http://geodesic.mathdoc.fr/item/MAN_1922__86_158933/