■ noun Mathematics a closed surface with only one side, formed by passing one end of a tube through the side of the tube and joining it to the other end.
Origin
1940s.: named after the German mathematician Felix Klein .
■ noun Mathematics a closed surface with only one side, formed by passing one end of a tube through the side of the tube and joining it to the other end.
Origin
1940s.: named after the German mathematician Felix Klein .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004