By using electric computer, via computation method, the result that symmetric groups S6 have 1455 subgroups is found. The generators of each subgroups are given.

This paper proposes a systematic method in the design of pole-changing windings based on reversing coil techniques and the concept "the minimum symmetric coil groups".

Because the fiber is of chemical inertion, low surface energy, lack of polar groups, and highly symmetric methylene structure, the fiber has a high degree of crystallinity and orientation.