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A theorem on approximate directional derivatives. (English) Zbl 0155.10503


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References:

[1] S. Saks , Theory of the Integral, Monografie Matematyczne 7 , Warszawa - Lwow , 1937 . JFM 63.0183.05 · JFM 63.0183.05
[2] W. Stepanoff , Sur les conditions de l’existence de la differentielle tolale , Rec. Math. Soc. Math. Moscow (Mat Sb.) 32 ( 1925 ) 511 - 526 . JFM 51.0207.07 · JFM 51.0207.07
[3] H. Whitney , On totally differentiable and smooth functions , Pac. J. Math. 1 ( 1951 ) 143 - 159 . Article | MR 43878 | Zbl 0043.05803 · Zbl 0043.05803
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