... explainedspecifically, in almost all literature related to time scales. The readers who are unfamiliar withthis area can consult, for example, 6, 11–13, 25, 26 for details. The organization of ... Sivasundaram, and B. Kaymakcalan, Dynamic Systems on Measure Chains, vol.370 of Mathematics and Its Applications, Kluwer Academic Publishers, Dordrecht, The Netherlands,1996.15 L. Erbe, A. ... constructing available upper and lower solutions and combining the Schauder’s fixed pointtheorem with maximum principle, this paper establishes sufficient and necessary conditions toguarantee the...