A.4.1 Milnor and Tjurina number A.4.2 Critical points A.4.3 Polar curves A.4.4 T1 and T2 A.4.5 Deformations A.4.6 Invariants of plane curve singularities A.4.7 Branches of space curve singularities A.4.8 Classification of hypersurface singularities A.4.9 Resolution of singularities