Abstract
Many problems arising in applications impose nonnegativity requirements on the solutions that we obtain. What we understand by nonnegativity can be described using the concept of a cone. A cone is a special closed and convex subset of the underlying Banach space (the state space).
To know that you do not know is the best.
To pretend to know when you do not know is a disease.
Lao Tzu
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Papageorgiou, N.S., Rădulescu, V.D., Repovš, D.D. (2019). Partial Order, Fixed Point Theory, Variational Principles. In: Nonlinear Analysis - Theory and Methods. Springer Monographs in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-030-03430-6_4
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DOI: https://doi.org/10.1007/978-3-030-03430-6_4
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