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Positive derivatives and increasing functions.
Elemente der Mathematik, Tome 43 (1988) no. 3, pp. 120-121

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Mots-clés : monotonicity, right upper Dini derivative, symmetric derivative 
Lawrence Zalcman. Positive derivatives and increasing functions.. Elemente der Mathematik, Tome 43 (1988) no. 3, pp. 120-121. http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141435/
@article{ELMA_1988__43_3_141435,
     author = {Lawrence Zalcman},
     title = {Positive derivatives and increasing functions.},
     journal = {Elemente der Mathematik},
     pages = {120--121},
     year = {1988},
     volume = {43},
     number = {3},
     zbl = {0701.26006},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141435/}
}
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