Existence results for the generalized Riemann–Liouville type fractional Fisher-like equation on the half-line

In this paper, we discuss the existence of multiplicity of positive solutions to a new generalized Riemann–Liouville type fractional Fisher-like equation on a semi-infinite interval equipped with nonlocal multipoint boundary conditions involving Riemann–Liouville fractional derivative and integral operators. The existence of at least two positive solutions for the given problem is established by using the concept of complete continuity and iterative positive solutions. We show the existence of at least three positive solutions to the problem at hand by applying the generalized Leggett–Williams fixed-point theorem due to Bai and Ge [Z. Bai, B. Ge, Existence of three positive solutions for some second-order boundary value problems, Comput. Math. Appl. 48 (2014) 699-70]. Illustrative examples are constructed to demonstrate the effectiveness of the main results. It has also been indicated in Section 5 that some new results appear as special cases by choosing the parameters involved in the given problem appropriately.