Abstract
General necessary and sufficient conditions of the k-th order (where k >0) for an extremum of an arbitrary function defined on an arbitrary metric space are stated. Examples illustrating the theory are described.
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References
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Demyanov, V. Conditions for an Extremum in Metric Spaces. Journal of Global Optimization 17, 55–63 (2000). https://doi.org/10.1023/A:1026599021286
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DOI: https://doi.org/10.1023/A:1026599021286