In this note we extend a spectrum which was introduced by Furi, Martelli and the third author in 1978 for continuous nonlinear maps to a certain new spectrum for a “semilinear pair” (), with being a linear Fredholm operator of index zero, and being nonlinear and continuous.
Cite this article
Jürgen Appell, Espedito De Pascale, A. Vignoli, A Semilinear Furi-Martelli-Vignoli Spectrum. Z. Anal. Anwend. 20 (2001), no. 3, pp. 565–577DOI 10.4171/ZAA/1031