| (subclass Equation Proposition) | engineering.kif 150-150 | 方程 是 命题 的 subclass |
| (subclass DifferentialEquation Equation) | engineering.kif 154-154 | 微分方程 是 方程 的 subclass |
| (subclass LinearEquation Equation) | engineering.kif 160-160 | 线性方程 是 方程 的 subclass |
| (subclass NonlinearEquation Equation) | engineering.kif 164-164 | 非线性方程 是 方程 的 subclass |
| (subclass AlgebraicEquation Equation) | engineering.kif 168-168 | 代数方程式 是 方程 的 subclass |
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