URL：https://www.researchgate.net/publication/339388988/figure/fig1/AS:962343802511360@1606452050008/Poincare-compactification-of-a-vector-field-f-The-phase-space.png
掲載元：https://www.researchgate.net/figure/Poincare-compactification-of-a-vector-field-f-The-phase-space_fig1_339388988
