The existence of almost periodic solutions of a certain nonlinear system

Positive Almost Periodic Solution for a Model of Hematopoiesis with Infinite Time Delays and a Nonlinear Harvesting Term

“…Neutral functional differential equations arise in many areas of applied mathematics; it has received considerable attention in the recent decades. There have been many remarkable works (see, [1][2][3][4][5]). It is well known that there has been considerable interest in the existence of almost periodic solutions of functional differential equations [3][4][5][6][7][8][9].…”

The analysis of some special solutions of Mackey–Glass equation with variable delays

“…Consequently, this article is more comprehensive compared to previous studies. Figure 1 shows that trajectory of (12).…”

“…1,2,4 The investigation of almost periodic (AP) and pseudo almost periodic (PAP) differential equations is one of the most interesting topics for many mathematicians. [7][8][9][10][11][12][13][14] Diagana 15 familiarized the concept of WPAP functions, which is a natural generalization of the concept of PAP functions. Since then, some interesting and remarkable results concerning composition theorem, translation invariance, and the ergodicity of WPAP were obtained.…”

Periodic Orbits of Radially Symmetric Keplerian-Like Systems with a Singularity

“…Concerned with singular differential equations or singular dynamical systems, the question of the existence of periodic solutions is one of the central topics and therefore has attracted much attention [2,3,[8][9][10][11][12][13][14][15][16]. More general systems, of the type…”