An example of a function which is locally constant in an open dense set, everywhere differentiable but not constant
Zofia Denkowska
Annales Polonici Mathematici, Tome 28 (1973), p. 195-199 / Harvested from The Polish Digital Mathematics Library
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Publié le : 1973-01-01
EUDML-ID : urn:eudml:doc:265140 
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     author = {Zofia Denkowska},
     title = {An example of a function which is locally constant in an open dense set, everywhere differentiable but not constant},
     journal = {Annales Polonici Mathematici},
     volume = {28},
     year = {1973},
     pages = {195-199},
     zbl = {0269.26006},
     language = {en},
     url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-5edce04e-b980-4f93-9061-8236e8a34403}
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Zofia Denkowska. An example of a function which is locally constant in an open dense set, everywhere differentiable but not constant. Annales Polonici Mathematici, Tome 28 (1973) pp. 195-199. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-5edce04e-b980-4f93-9061-8236e8a34403/