This cluster of papers focuses on the study of bifurcations in planar polynomial systems, particularly emphasizing piecewise linear structures, limit cycles, Hopf bifurcations, discontinuous systems, nilpotent singularities, Darboux integrability, and Abelian integrals.
Bifurcations; Planar Systems; Piecewise Linear; Limit Cycles; Polynomial Vector Fields; Hopf Bifurcation; Discontinuous Systems; Nilpotent Singularity; Darboux Integrability; Abelian Integrals