In a 1695 letter to L’Hospital, Leibniz asked, “Can we generalize ordinary derivatives to ones of arbitrary order?” L’Hospital replied to Leibniz with another question, “What if the order is 1/2?” Then Leibniz, in a letter dated September 30, 1695 replied, “It will lead to a paradox,” from which one day many useful consequences will be drawn.
Studies in Systems, Decision and Control
Anastassiou, G. (2021). Concluding Remarks. Studies in Systems, Decision and Control, 362, 521-522. https://doi.org/10.1007/978-3-030-71481-9_26