K had proved the following theorem(Sea[1]) Thsorem A Let every 2-maximal subgroup of a finite solvable group G be Sqn in G. Then G is supersolvable.

• K证明了下述定理(见[1]): 定理A 若有限群G可解且其每个二次极大子群在G中S-拟正规,则G超可解。