derivation space 导数空间
A constraining facet is a construct that you can use to control the value space of simple type during derivation.
约束facet是一种构造，可以在派生期间使用它们控制简单类型的值空间。
The formula of reliability index is calculated in the origin space directly, so derivation and orthogonal transformation are avoided.
所用的可靠度计算公式直接在基本变量空间中求解，避免了繁琐的求偏导数和正交变换工作。
State equations the derivation of state space models is no different from that of transfer function in that the differential equations describing the system dynamics are written first.
状态空间模型的推导与传递函数的推导没有什么不同，总是先将描述系统特性微分方程写出来。
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