An Affine Birkhoff–Kellogg Type Result in Product Spaces and Its Application to Differential Systems

ABSTRACT We prove a version of the Birkhoff–Kellogg theorem in product spaces, under affine transformations. This is a fairly natural framework that arises when dealing with parameter‐dependent systems of functional differential equations. We provide criteria on the existence of parameter‐dependent solutions that have all the components nontrivial. The theoretical results are illustrated in the case of systems of second‐order functional differential equations, where the functional part can cover the interesting cases of time‐ and state‐dependent deviated arguments. We provide a concrete example, for which we furnish numerically approximated solutions, coherent with our theoretical framework, and in which we compute or estimate all the constants that are required by our abstract results.