2017 is the sesquicentennial of Grünwald’s demonstration that differentiation and integration can be united into a single
operation which, moreover, could then be extended to unlimited orders. This text provides an overview of how such “differintegration”
may be defined and implemented. The basis of its valuable application in electrochemistry is explained.

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• How Grünwald unified and generalized the calculus, and how his discovery helps electrochemists