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    • An Extremum Principle for Smooth Problems 

      Idczak, Dariusz ORCID; Walczak, Stanislaw ORCID (MDPI, 2020)
      We derive an extremum principle. It can be treated as an intermediate result between the celebrated smooth-convex extremum principle due to Ioffe and Tikhomirov and the Dubovitskii–Milyutin theorem. The proof of this ...