自由构形是超平面构形中一类重要的构形.Free arrangement is a very important kind of hyperplane arrangement.又, X中超平面为T—列闭当且仅当它为T~ -— 闭.Also, a hyperplane in X is Tsequentially closed iff it is T ~ - - closed....

“超平面”的英语可以翻译为：[计] hyperplane ...