In algebra, the bicommutant of a subset S of a semigroup (such as an algebra or a group) is the commutant of the commutant of that subset. It is also known as the double commutant or second commutant and is written S^{prime prime}.
网络释义
1、对换位阵
...对换角色 trade place对换位阵 bicommutant对换系统 swapping system ...