We consider a monotone increasing operator in an ordered Banach space having u- and u+ as a strong super- and subsolution, respectively. In contrast with the well-studied case u+ < u -, we suppose that u- < u+. Under the assumption that the order cone is normal and minihedral, we prove the existence of a fixed point located in the order interval [u-, u+]. © 2012 Kostrykin and Oleynik; licensee Springer.
CITATION STYLE
Kostrykin, V., & Oleynik, A. (2012). An intermediate value theorem for monotone operators in ordered Banach spaces. Fixed Point Theory and Applications, 2012. https://doi.org/10.1186/1687-1812-2012-211
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