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Preiss, David
On the first derivative of real functions (Preliminary communication). (English). Commentationes Mathematicae Universitatis Carolinae, vol. 11 (1970), issue 4, pp. 817-822
MSC: 26-40, 26A24, 26Axx | MR 0274669 | Zbl 0206.06602
References:
[1] Z. ZAHORSKI: Sur la première dérivée. Trans. Amer. Math. Soc. 69 (1950), 1-54. MR 0037338 | Zbl 0038.20602
[2] J. S. LIPIŃSKI: Une propriété des ensembles ${f'(x)>a}$. Fund. Math. 42 (1955), 339-342. MR 0076842
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