Positive solutions for nonlinear fractional differential equations with coefficient that changes sign

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Multiple positive solutions for (n-1, 1)-type semipositone conjugate boundary value problems of nonlinear fractional differential equations (2010, background): “3 ([12]) Let X be a Banach space with Ω ⊂ X be closed and convex.”
Existence results for one‐dimensional fractional equations (2014, background): “In this paper, motivated by a theoretical point of view, we are interested on the one-dimensional setting, previously considered in several papers (see, for instance, the manuscripts [11, 12] and references therein).”
Two positive solutions for (n − 1, 1)-type semipositone integral boundary value problems for coupled systems of nonlinear fractional differential equations☆ (2012, background): “5 [12] Let X be a Banach space with Ω ⊂ X be closed and convex.”
Positive solutions for boundary value problems of nonlinear fractional differential equation (2009, unknown): “Bai [8], S.”