Summary: Existence criteria of three positive solutions to the following nonlinear first-order boundary value problem on time scales
are established by using the fixed-point theorem due to J. Ren, W. Ge and B. Ren [Acta Math. Appl. Sin., Engl. Ser. 21, No. 3, 353–358 (2005; Zbl 1113.34016)]. An example is also given to illustrate the main result.