RT journal article T1 Dissipative Gradient Nonlinearities Prevent δ-Formations in Local and Nonlocal Attraction–Repulsion Chemotaxis Models A1 Li, Tongxing A1 Acosta Soba, Daniel A1 Columbu, Alessandro A1 Viglialoro, Giuseppe A2 Matemáticas K1 attraction–repulsion K1 boundedness K1 chemotaxis K1 gradient nonlinearities K1 nonlinear production K1 simulations AB We study a class of zero-flux attraction–repulsion chemotaxis models, characterized by nonlinearities laws for the diffusion of the cell density (Formula presented.), the chemosensitivities and the production rates of the chemoattractant (Formula presented.) and the chemorepellent (Formula presented.). In addition, a source involving also the gradient of (Formula presented.) is incorporated. Our overall study touches on different aspects: we address questions connected to local well-posedness, we derive sufficient conditions to ensure boundedness of solutions, and finally, we develop numerical simulations giving insights into the evolution of the system. PB Wiley SN 1467-9590 YR 2025 FD 2025-02-04 LK http://hdl.handle.net/10498/36422 UL http://hdl.handle.net/10498/36422 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 10-may-2026