对交换环定义了广义p F环的概念，即一切具有常数秩的有限生成投射模都为自由模的交换环。
A generalization of PF rings relative to commutative rings: rings all finitely generated projective modules with constant rank of which are free is defined.
马克思从实践概念的逻辑运动中揭示出历史运动中主体与客体的辩证关系，他在自由概念的逻辑运动中揭示出自由主体生成的历史过程。
Starts with the concept of practice, Marx has posted the dialectical relationship between the subject and object, and has explored the historical process of the formation of free subject.
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