(subclass VanderpolsEquation OrdinaryDifferentialEquation) | engineering.kif 199-199 | VanderpolsEquation est une sous-classe de OrdinaryDifferentialEquation |
(subclass VanderpolsEquation NonlinearEquation) | engineering.kif 200-200 | VanderpolsEquation est une sous-classe de NonlinearEquation |