Abstract
The counting function on binary values is extended to the signed case in order to count the number of transitions between contiguous locations. A generalized subdifferential for this sign change counting function is given where classical subdifferentials remain intractable. An attempt to prove global optimality at some point, for the 4-dimensional first non trivial example, is made by using a sufficient condition specially tailored among all the cases for this subdifferential.
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Fortin, D., Tseveendorj, I. Generalized subdifferentials of the sign change counting function. J Glob Optim 65, 41–56 (2016). https://doi.org/10.1007/s10898-015-0332-1
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DOI: https://doi.org/10.1007/s10898-015-0332-1