Sommer, Manfred Examples of unicity subspaces in \(L_ 1\)-approximation. (English) Zbl 0584.41012 Numer. Funct. Anal. Optimization 9, 131-146 (1987). MSC: 41A65 41A15 PDFBibTeX XMLCite \textit{M. Sommer}, Numer. Funct. Anal. Optim. 9, 131--146 (1987; Zbl 0584.41012) Full Text: DOI
Sommer, Manfred Parametric approximation by splines. (English) Zbl 0534.41010 Numer. Funct. Anal. Optimization 7, 1-21 (1984). MSC: 41A15 41A50 PDFBibTeX XMLCite \textit{M. Sommer}, Numer. Funct. Anal. Optim. 7, 1--21 (1984; Zbl 0534.41010) Full Text: DOI
Sommer, Manfred Some results on best \(L_ 1\)-approximation of continuous functions. (English) Zbl 0534.41017 Numer. Funct. Anal. Optimization 6, 253-271 (1983). MSC: 41A52 41A30 41A50 41A63 PDFBibTeX XMLCite \textit{M. Sommer}, Numer. Funct. Anal. Optim. 6, 253--271 (1983; Zbl 0534.41017) Full Text: DOI
Sommer, Manfred Continuous selections and convergence of best \(L_ p\)-approximations in subspaces of spline functions. (English) Zbl 0529.41012 Numer. Funct. Anal. Optimization 6, 213-234 (1983). MSC: 41A15 41A65 41A50 PDFBibTeX XMLCite \textit{M. Sommer}, Numer. Funct. Anal. Optim. 6, 213--234 (1983; Zbl 0529.41012) Full Text: DOI
Sommer, Manfred; Strauss, Hans Unicity of best one-sided \(L_ 1-\)approximations for certain classes of spline functions. (English) Zbl 0498.41017 Numer. Funct. Anal. Optimization 4, 413-435 (1982). MSC: 41A52 41A15 41A30 41A50 41A55 PDFBibTeX XMLCite \textit{M. Sommer} and \textit{H. Strauss}, Numer. Funct. Anal. Optim. 4, 413--435 (1982; Zbl 0498.41017) Full Text: DOI
Blatt, Hans-Peter; Nürnberger, Günther; Sommer, Manfred A characterization of pointwise-Lipschitz-continuous selections for the metric projection. (English) Zbl 0488.41034 Numer. Funct. Anal. Optimization 4(1981), 101-121 (1982). MSC: 41A65 41A50 41A30 41A15 PDFBibTeX XMLCite \textit{H.-P. Blatt} et al., Numer. Funct. Anal. Optim. 4, 101--121 (1982; Zbl 0488.41034) Full Text: DOI