TY - JOUR AU - V. I. Arnol'd TI - Algebraic unsolvability of the problem of stability and the problem of the topological classification of the singular points of analytic systems of differential equations JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1970 VL - 25 IS - 2 UR - http://geodesic.mathdoc.fr/item/RM_1970_25_2_a9/ LA - ru ID - RM_1970_25_2_a9 ER -