论文标题
克莱因瓶组的口头并没有强烈关闭，尽管非常接近
The Klein bottle group is not strongly verbally closed, though awfully close to being so
论文作者
论文摘要
根据Mazhuga的定理，任何连接的表面的基本组$ h $，可能是Klein瓶，是每个有限生成的组，其中包含$ h $作为口头封闭的子组。我们证明克莱因瓶组确实是一个例外，但拥有非常接近的财产。
According to Mazhuga's theorem, the fundamental group $H$ of any connected surface, possibly except for the Klein bottle, is a retract of each finitely generated group containing $H$ as a verbally closed subgroup. We prove that the Klein bottle group is indeed an exception but has a very close property.
