Fixed point theory for multivalued maps in Fréchet spaces via degree and index theory
R.P. Agarwal, D. O'Regan, D.R. Sahu (2007)
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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New fixed point results are presented for multivalued maps defined on subsets of a Fréchet space E. The proof relies on the notion of a pseudo open set, degree and index theory, and on viewing E as the projective limit of a sequence of Banach spaces.