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Sia E uno spazio di Banach e f: E→E un operatore continuo, non necessariamente lineare. Si danno delle condizioni su f affinchè l’equazione x-f(x)=y sia risolubile per ogni y∈E.
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Entrata in Redazione il 30 dicembre 1975.
This paper was written while the authors where visiting at the Mathematics Department of the University of Bonn in the « Sonderforschungsbereich 72 » programm.
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Furi, M., Vignoli, A. On surjectivity for nonlinear maps in banach spaces. Annali di Matematica 112, 205–216 (1977). https://doi.org/10.1007/BF02413482
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DOI: https://doi.org/10.1007/BF02413482