BELOUADI, Khadidja MarouaBELATTAR, Zokha2024-12-152024-12-152020http://dspace.univ-temouchent.edu.dz/handle/123456789/5940The objective of this thesis is the theoretical and qualitative study of mathematical models applied to science, using some type of bifurcation, we are interested in examining the bifurcation P-A-H and bifurcation cusp theoretically.frThéorème des fonctions implicites, stabilité, valeur propre, vecteur propre, matrice jacobienne, fonction de lyapunov.The implicit function theorem, Stability, eigenvalues, eigenvectors, Jacobian matrix, Liapunov FunctionThesis