Li, ZhixiangWang, Xiao2021-07-152021-07-152006-03-17Li, Z., & Wang, X. (2006). Existence of positive periodic solutions for neutral functional differential equations. <i>Electronic Journal of Differential Equations, 2006</i>(34), pp. 1-8.1072-6691https://hdl.handle.net/10877/13907We find sufficient conditions for the existence of positive periodic solutions of two kinds of neutral differential equations. Using Krasnoselskii's fixed-point theorem in cones, we obtain results that extend and improve previous results. These results are useful mostly when applied to neutral equations with delay in bio-mathematics.Text8 pages1 file (.pdf)enAttribution 4.0 InternationalPositive periodic solutionConeNeutral delay differential equationFixed-point theoremArticleThis work is licensed under a Creative Commons Attribution 4.0 International License.