Ravi P. Agarwal, Donal O'Regan, "Birkhoff-Kellogg theorems on invariant directions for multimaps", Abstract and Applied Analysis, vol. 2003, Article ID 207650, 14 pages, 2003. https://doi.org/10.1155/S1085337503205030
Birkhoff-Kellogg theorems on invariant directions for multimaps
We establish Birkhoff-Kellogg type theorems on invariant directions for a general class of maps. Our results, in particular, apply to Kakutani, acyclic, O'Neill, approximable, admissible, and maps.
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