### R. Hilfer, T. Kleiner

Mathematics **8**, 1107 (2020)

https://doi.org/10.3390/math8071107

submitted on

Wednesday, March 11, 2020

The purpose of this short communication is to announce the existence of fractional calculi on precisely specified domains of distributions. The calculi satisfy desiderata proposed above in Mathematics 7, 149 (2019). For the desiderata (a)–(c) the examples are optimal in the sense of having maximal domains with respect to convolvability of distributions. The examples suggest to modify desideratum (f) in the original list.

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