Seminars: A. A. Klyachko, What is the difference between the Klein bottle group and all other surface groups?

SEMINARS


Mathematical Colloquium of the Bauman Moscow State Technical University July 9, 2020 17:30, Moscow, This talk will be organized as Zoom video-meeting

What is the difference between the Klein bottle group and all other surface groups? A. A. Klyachko
Abstract: 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. I shall talk about this and similar fact and explain how to treat the Klein bottle. Zoom-conference identificator: 833 9984 9040; Password: 990340 Website: https://us02web.zoom.us/j/83399849040?pwd=YnBML3pEWnUzbDdELzBvQ2lqeXo5UT09