Existence of positive periodic solutions for neutral logarithmic population model with multiple delays

In this paper, the authors employ an abstract continuous theorem of k-set contractive operator to study the existence of positive periodic solutions for a neutral delay logarithmic population model with multiple delays as follows:dNdt=N(t)r(t)−∑j=1n ai(t)ln N(t−σi(t))−∑i=1m bj(t) ddtln N(t−τj(t)).A new result on the existence of positive periodic solutions is obtained.