Positive solutions to a system of second-order nonlocal boundary value problems

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Solutions of perturbed Hammerstein integral equations with applications (2016, background): “4) α1x ≤ h(x) ≤ α2x, for every x ≥ 0, where 0 ≤ α1 ≤ α2, as in [34, 36, 38, 40, 50, 54, 80], or an asymptotic condition, as in [16, 22, 24, 25, 26, 27, 28, 29], or a kind of mixture of the two, as in [89, 90].”
Multiple positive solutions of singular fractional differential system involving Stieltjes integral conditions (2012, background): “It should be noted that the nonlinearity in most of the previous works needs to be nonnegative to get the positive solutions [1-12,14-17].”
Nonzero radial solutions for a class of elliptic systems with nonlocal BCs on annular domains (2014, unknown): “Nonlinearities with different growths were considered, with different approaches, in [8, 43, 44, 60] .”