ocr: + - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - I - - - - - : : - - - - HA - - - L dhe - I cntical point [ti is a constant trajoctory. 1.3.4. This is a garden-vanety 1.3.5. This is the phase portrait of thc vectorticld in the plane, The zero vec- vectorbeld to the left The trujcclory ul toHr Hppcurs unce. as the velociry vector the critical point is again piled up on the of the critical point. C. Nearby, yeclurs are short,