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Abstract theorems for the existence of coexistence states for systems of equations in ordered Banach spaces

Mohammed Said El Khannoussi, Abderrahim Zertiti


In this paper, we generalize some known result’s of Krasnosel’skii and Amann in order to assure the existence of coexistence states for systems of equations in ordered Banach spaces. To this end, we use topological methods, more precisely, the fixed point index.


Positive solutions, fixed point index, systems of equations, nonlinear fractional differential equations.

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