Ackermann, Nils Uniform continuity and Brézis-Lieb-type splitting for superposition operators in Sobolev space. (English) Zbl 06992610 Adv. Nonlinear Anal. 7, No. 4, 587-599 (2018). MSC: 47H30 58E40 PDF BibTeX XML Cite \textit{N. Ackermann}, Adv. Nonlinear Anal. 7, No. 4, 587--599 (2018; Zbl 06992610) Full Text: DOI arXiv OpenURL
Ackermann, Nils Long-time dynamics in semilinear parabolic problems with autocatalysis. (English) Zbl 1181.35136 Du, Yihong (ed.) et al., Recent progress on reaction-diffusion systems and viscosity solutions. Based on the international conference on reaction-diffusion systems and viscosity solutions, Taichung, Taiwan, January 3–6, 2007. Hackensack, NJ: World Scientific (ISBN 978-981-283-473-7/hbk). 1-30 (2009). MSC: 35K58 35K20 35B40 35B33 PDF BibTeX XML Cite \textit{N. Ackermann}, in: Recent progress on reaction-diffusion systems and viscosity solutions. Based on the international conference on reaction-diffusion systems and viscosity solutions, Taichung, Taiwan, January 3--6, 2007. Hackensack, NJ: World Scientific. 1--30 (2009; Zbl 1181.35136) OpenURL
Ackermann, Nils Solution set splitting at low energy levels in Schrödinger equations with periodic and symmetric potential. (English) Zbl 1156.35024 J. Differ. Equations 246, No. 4, 1470-1499 (2009). MSC: 35J60 35J10 35J20 35B05 PDF BibTeX XML Cite \textit{N. Ackermann}, J. Differ. Equations 246, No. 4, 1470--1499 (2009; Zbl 1156.35024) Full Text: DOI OpenURL
Ackermann, Nils A nonlinear superposition principle and multibump solutions of periodic Schrödinger equations. (English) Zbl 1126.35057 J. Funct. Anal. 234, No. 2, 277-320 (2006). Reviewer: Thomas Ernst (Uppsala) MSC: 35Q55 35B10 PDF BibTeX XML Cite \textit{N. Ackermann}, J. Funct. Anal. 234, No. 2, 277--320 (2006; Zbl 1126.35057) Full Text: DOI OpenURL
Ackermann, Nils An abstract approach to multibump solutions of periodic Schrödinger equations and applications. (English) Zbl 1224.35112 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 63, No. 5-7, e1031-e1037 (2005). MSC: 35J60 35B10 47J30 PDF BibTeX XML Cite \textit{N. Ackermann}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 63, No. 5--7, e1031--e1037 (2005; Zbl 1224.35112) Full Text: DOI OpenURL
Ackermann, Nils A Cauchy-Schwarz type inequality for bilinear integrals on positive measures. (English) Zbl 1066.26013 Proc. Am. Math. Soc. 133, No. 9, 2647-2656 (2005). MSC: 26D15 43A35 35J20 60E15 42A82 PDF BibTeX XML Cite \textit{N. Ackermann}, Proc. Am. Math. Soc. 133, No. 9, 2647--2656 (2005; Zbl 1066.26013) Full Text: DOI OpenURL
Ackermann, Nils On a periodic Schrödinger equation with nonlocal superlinear part. (English) Zbl 1059.35037 Math. Z. 248, No. 2, 423-443 (2004). MSC: 35J60 35Q40 35J20 35B10 49J35 81V70 PDF BibTeX XML Cite \textit{N. Ackermann}, Math. Z. 248, No. 2, 423--443 (2004; Zbl 1059.35037) Full Text: DOI OpenURL
Ackermann, Nils On the multiplicity of sign changing solutions to nonlinear periodic Schrödinger equations. (English) Zbl 1060.35128 Brezis, H. (ed.) et al., Topology methods, variational methods, and their applications. Proceedings of the ICM 2002 satellite conference on nonlinear functional analysis, Taiyuan, China, August 14–18, 2002. River Edge, NJ: World Scientific (ISBN 981-238-262-3/hbk). 1-9 (2003). Reviewer: Messoud A. Efendiev (Berlin) MSC: 35Q55 35B10 PDF BibTeX XML Cite \textit{N. Ackermann}, in: Topology methods, variational methods, and their applications. Proceedings of the ICM 2002 satellite conference on nonlinear functional analysis, Taiyuan, China, August 14--18, 2002. River Edge, NJ: World Scientific. 1--9 (2003; Zbl 1060.35128) OpenURL
Ackermann, Nils Multiple single-peaked solutions of a class of semilinear Neumann problems via the category of the domain boundary. (English) Zbl 0917.35037 Calc. Var. Partial Differ. Equ. 7, No. 3, 263-292 (1998). Reviewer: Charles A.Swanson (Vancouver) MSC: 35J65 35J20 58E05 PDF BibTeX XML Cite \textit{N. Ackermann}, Calc. Var. Partial Differ. Equ. 7, No. 3, 263--292 (1998; Zbl 0917.35037) Full Text: DOI OpenURL