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MATHEMATICA BOHEMICA, Vol. 124, No. 4, pp. 381-399 (1999)
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# The non-coincidence of ordinary and Peano derivatives

## Zoltan Buczolich, Clifford E. Weil

* Zoltan Buczolich*, Department of Analysis, Eötvös Lorand University, Rakoczi ut 5, 1088 Budapest, Hungary; * Clifford E. Weil*, Mathematics Department, Michigan State University, East Lansing, MI 48824-1027, USA

**Abstract:**
Let $f H\subset\Bbb R\to\Bbb R$ be $k$ times differentiable in both the usual (iterative) and Peano senses. We investigate when the usual derivatives and the corresponding Peano derivatives are different and the nature of the set where they are different.

**Keywords:** Peano derivatives, nowhere dense perfect sets, porosity

**Classification (MSC2000):** 26A24

**Full text of the article:**

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