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20092026
most citedNonzero positive solutions of elliptic systems with gradient dependence and functional BCs

17 citations · 47 across the 24 of their papers we have counts for

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math.FA2025

Birkhoff-Kellogg type results in product spaces and their application to differential systems

Alessandro Calamai, Gennaro Infante, Jorge Rodríguez-López

We provide a new version of the well-known Birkhoff-Kellogg invariant-direction Theorem in product spaces. Our results concern operator systems and give the existence of component-…