Mazaheri, H.; Salehi, M. J. The convexity of Chebyshev sets in normed spaces. (English) Zbl 1513.46025 J. Mahani Math. Res. Cent. 10, No. 1, 111-117 (2021). MSC: 46B20 41A65 41A52 46N10 PDFBibTeX XMLCite \textit{H. Mazaheri} and \textit{M. J. Salehi}, J. Mahani Math. Res. Cent. 10, No. 1, 111--117 (2021; Zbl 1513.46025) Full Text: DOI
Baronti, Marco; Franchetti, Carlo; Papini, Pier Luigi Farthest and nearest points in balls of subspaces. (English) Zbl 1323.41032 Boll. Unione Mat. Ital. 8, No. 2, 121-129 (2015). MSC: 41A65 46B99 46C15 PDFBibTeX XMLCite \textit{M. Baronti} et al., Boll. Unione Mat. Ital. 8, No. 2, 121--129 (2015; Zbl 1323.41032) Full Text: DOI
Patel, Prashantkumar; Mishra, Vishnu Narayan On new class of linear and positive operators. (English) Zbl 1323.41026 Boll. Unione Mat. Ital. 8, No. 2, 81-96 (2015). MSC: 41A36 41A25 41A30 PDFBibTeX XMLCite \textit{P. Patel} and \textit{V. N. Mishra}, Boll. Unione Mat. Ital. 8, No. 2, 81--96 (2015; Zbl 1323.41026) Full Text: DOI
Singer, Ivan Maximization of lower semi-continuous convex functionals on bounded subsets of locally convex spaces. II: Quasi-Lagrangian duality theorems. (English) Zbl 0459.90088 Result. Math. 3, 235-248 (1980). MSC: 90C48 46A03 PDFBibTeX XMLCite \textit{I. Singer}, Result. Math. 3, 235--248 (1980; Zbl 0459.90088) Full Text: DOI
Singer, Ivan Maximization of lower semi-continuous convex functionals on bounded subsets of locally convex spaces. I: Hyperplane theorems. (English) Zbl 0421.90077 Appl. Math. Optimization 5, 349-362 (1979). MSC: 90C48 46A03 PDFBibTeX XMLCite \textit{I. Singer}, Appl. Math. Optim. 5, 349--362 (1979; Zbl 0421.90077) Full Text: DOI