Berkovits, J. A reduction theorem for the topological degree for mappings of class \((S+)\). (English) Zbl 1117.47047 Proc. Am. Math. Soc. 135, No. 7, 2059-2064 (2007). Reviewer: Grzegorz Gabor (Toruń) MSC: 47H11 47J05 PDFBibTeX XMLCite \textit{J. Berkovits}, Proc. Am. Math. Soc. 135, No. 7, 2059--2064 (2007; Zbl 1117.47047) Full Text: DOI
Berkovits, J. Extension of the Leray-Schauder degree for abstract Hammerstein type mappings. (English) Zbl 1114.47049 J. Differ. Equations 234, No. 1, 289-310 (2007). Reviewer: Radu Precup (Cluj-Napoca) MSC: 47H11 47H05 47N20 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Differ. Equations 234, No. 1, 289--310 (2007; Zbl 1114.47049) Full Text: DOI
Berkovits, J.; Fabry, C. Semilinear problems with a non-symmetric linear part having an infinite dimensional kernel. (English) Zbl 1082.47055 Port. Math. (N.S.) 61, No. 4, 439-459 (2004). Reviewer: Peter Zabreiko (Minsk) MSC: 47J05 47H11 47J25 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{C. Fabry}, Port. Math. (N.S.) 61, No. 4, 439--459 (2004; Zbl 1082.47055) Full Text: EuDML
Berkovits, Juha On the Leray-Schauder formula and bifurcation. (English) Zbl 0992.47030 J. Differ. Equations 173, No. 2, 451-469 (2001). Reviewer: Ulrich Kosel (Freiberg) MSC: 47J15 47H11 35L05 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Differ. Equations 173, No. 2, 451--469 (2001; Zbl 0992.47030) Full Text: DOI
Berkovits, J. Some extensions of topological degree theory with applications to nonlinear problems. (English) Zbl 0906.47047 Drábek, Pavel (ed.), Topological and variational methods for nonlinear boundary value problems. Proceedings of the 20th seminar in partial differential equations, Cholín, Czech Republic, June 5–9, 1995. Harlow: Longman. Pitman Res. Notes Math. Ser. 365, 1-29 (1997). Reviewer: V.Mustonen (Oulu) MSC: 47H11 35L70 PDFBibTeX XMLCite \textit{J. Berkovits}, Pitman Res. Notes Math. Ser. 365, 1--29 (1997; Zbl 0906.47047)
Berkovits, Juha Local bifurcation results for systems of semilinear equations. (English) Zbl 0877.58017 J. Differ. Equations 133, No. 2, 245-254 (1997). Reviewer: V.Moroz (Minsk) MSC: 58E07 47J10 35L70 55M25 47H11 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Differ. Equations 133, No. 2, 245--254 (1997; Zbl 0877.58017) Full Text: DOI
Berkovits, Juha; Tienari, Matti Topological degree theory for some classes of multis with applications to hyperbolic and elliptic problems involving discontinuous nonlinearities. (English) Zbl 0851.47044 Dyn. Syst. Appl. 5, No. 1, 1-18 (1996). MSC: 47J25 47H11 58C06 35R05 47H04 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{M. Tienari}, Dyn. Syst. Appl. 5, No. 1, 1--18 (1996; Zbl 0851.47044)
Berkovits, Juha; Mustonen, Vesa On semilinear wave equations at resonance. (English) Zbl 0856.35007 Lakshmikantham, V. (ed.), World congress of nonlinear analysis ’92. Proceedings of the first world congress, Tampa, FL, USA, August 19-26, 1992. 4 volumes. Berlin: de Gruyter. 2399-2407 (1996). Reviewer: J.Mawhin (Louvain-La-Neuve) MSC: 35B10 35L70 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, in: World congress of nonlinear analysts '92. Proceedings of the first world congress, Tampa, FL, USA, August 19-26, 1992. 4 volumes. Berlin: de Gruyter. 2399--2407 (1996; Zbl 0856.35007)
Berkovits, Juha Some bifurcation results for a class of semilinear equations via topological degree method. (English) Zbl 0783.47069 Bull. Soc. Math. Belg., Sér. B 44, No. 3, 237-247 (1992). Reviewer: J.Appell (Würzburg) MSC: 47J05 47H11 58E07 PDFBibTeX XMLCite \textit{J. Berkovits}, Bull. Soc. Math. Belg., Sér. B 44, No. 3, 237--247 (1992; Zbl 0783.47069)
Berkovits, J.; Mustonen, V. Topological degree for perturbations of linear maximal monotone mappings and applications to a class of parabolic problems. (English) Zbl 0806.47055 Rend. Mat. Appl., VII. Ser. 12, No. 3, 597-621 (1992). MSC: 47H11 47J05 35K30 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Rend. Mat. Appl., VII. Ser. 12, No. 3, 597--621 (1992; Zbl 0806.47055)
Berkovits, Juha; Mustonen, Vesa An extension of Leray-Schauder degree and applications to nonlinear wave equations. (English) Zbl 0724.47024 Differ. Integral Equ. 3, No. 5, 945-963 (1990). Reviewer: J.Appell (Würzburg) MSC: 47H05 47J05 35L05 35L70 55M25 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Differ. Integral Equ. 3, No. 5, 945--963 (1990; Zbl 0724.47024)
Berkovits, Juha On the degree theory for mappings of monotone type and applications. (English) Zbl 0621.47056 Linear Algebra Appl. 84, 243-249 (1986). Reviewer: S.Sessa MSC: 47J05 47H05 PDFBibTeX XMLCite \textit{J. Berkovits}, Linear Algebra Appl. 84, 243--249 (1986; Zbl 0621.47056) Full Text: DOI
Berkovits, Juha; Mustonen, Vesa On the topological degree for mappings of monotone type. (English) Zbl 0605.47060 Nonlinear Anal., Theory Methods Appl. 10, 1373-1383 (1986). Reviewer: J.Appell MSC: 47J05 47H05 35J65 55M25 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Nonlinear Anal., Theory Methods Appl. 10, 1373--1383 (1986; Zbl 0605.47060) Full Text: DOI