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Pointwise analysis of Riemann's “nondifferentiable” function

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We will show how to analyse the local regularity of functions with the help of the wavelet transform. These results will be applied to the function of Riemann, where we show the existence of a dense set of points where this function is differentiable. On another dense set we show the existence of local singularities of cusp type. On a third set we show differentiability to the right (left). On the remaining set the functions will be shown to be not differentiable.

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Oblatum 27-III-1990 & 20-XI-1990

Laboratoire Propre LP-7061, Centre National de la Recherche Scientifique Juin 1989

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Holschneider, M., Tchamitchian, P. Pointwise analysis of Riemann's “nondifferentiable” function. Invent Math 105, 157–175 (1991). https://doi.org/10.1007/BF01232261

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  • DOI: https://doi.org/10.1007/BF01232261

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