Laetsch, Theodore Minimax principles for convex eigenvalue problems. (English) Zbl 0591.47045 J. Math. Anal. Appl. 102, 328-347 (1984). Reviewer: St.Tersian MSC: 47J10 47H07 PDFBibTeX XMLCite \textit{T. Laetsch}, J. Math. Anal. Appl. 102, 328--347 (1984; Zbl 0591.47045) Full Text: DOI
Laetsch, Theodore A uniqueness theorem for elliptic quasi-variational inequalities. (English) Zbl 0327.49003 J. Funct. Anal. 18, 286-287 (1975). MSC: 49J20 PDFBibTeX XMLCite \textit{T. Laetsch}, J. Funct. Anal. 18, 286--287 (1975; Zbl 0327.49003) Full Text: DOI
Laetsch, Theodore Nonlinear eigenvalue problems with positively convex operators. (English) Zbl 0314.47042 J. Math. Anal. Appl. 51, 653-669 (1975). MSC: 47J05 47H10 47H05 52A30 46A40 PDFBibTeX XMLCite \textit{T. Laetsch}, J. Math. Anal. Appl. 51, 653--669 (1975; Zbl 0314.47042) Full Text: DOI
Laetsch, Theodore Comparison and positivity theorems for linear and nonlinear boundary value problems. (English) Zbl 0304.35032 J. Anal. Math. 27, 24-46 (1974). MSC: 35J25 35B05 PDFBibTeX XMLCite \textit{T. Laetsch}, J. Anal. Math. 27, 24--46 (1974; Zbl 0304.35032) Full Text: DOI
Laetsch, Theodore Uniqueness for sublinear boundary value problems. (English) Zbl 0247.35052 J. Differ. Equations 13, 13-23 (1973). MSC: 35J65 PDFBibTeX XMLCite \textit{T. Laetsch}, J. Differ. Equations 13, 13--23 (1973; Zbl 0247.35052) Full Text: DOI