Geodesic
On a class of discontinuous operators in Hilbert spaces
Commentationes Mathematicae Universitatis Carolinae, Tome 44 (2003) no. 2, pp. 197-202.

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We construct a class of discontinuous operators in infinite-dimensional separable Hilbert spaces, answering a natural question which arises in comparing a fixed point theorem of Altman and Shinbrot ([1], [4]) with its improvement obtained by Ricceri ([2], [3]).
Classification : 47H10
Keywords: fixed point; Hilbert space; weak topology; discontinouous operator 
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Boscarino, Sebastiano. On a class of discontinuous operators in Hilbert spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 44 (2003) no. 2, pp. 197-202. http://geodesic.mathdoc.fr/item/CMUC_2003__44_2_a0/