It is obtained that a necessary and sufficient condition for a closed fuzzyset to be a convexfuzzyset.
引入线性拓扑空间中的凸闭模糊集概念，得到闭模糊集是凸模糊集的充分必要条件。
2
The concept of closed fuzzyset is introduced in topological linear space. It is obtained that a necessary and sufficient condition for a closed fuzzyset to be a convexfuzzyset.