如果群G的所有真商群都是FO-群,但是群G本身不是FO-群,则称G为外FO-群,本文将给出外F0-群完全的结构描述.
A group G is said to be a just non-FO-group (a JNFO-group) if all its proper quotients are FO-groups, but G itself is not. In this paper, the structure of JNFO-groups is described.