This can include both constraints in general (for instance, not knowing what makes a good constraint), as well as a lack of knowledge regarding how to implement a constraint in a model.
这包含通常的约束(举例来说，不知道什么能形成好的约束)，和缺乏了解如何在模型中实现约束。
2
The general inference and demonstration of the equilibrium problem of particle system are carried on, the full and necessary conditions are given while the constraint is ideal, linear and scleronomic.
本文就质点系平衡问题进行了一般性的推证，给出了当约束是理想、线性定常约束时的质点系平衡的充要条件。
3
This paper provides a general study of this for transceivers with the zero-forcing constraint.