Just-infinite群
群論中一個無限群G稱為just-infinite,如果G的所有真商群都是有限群,也就是說所有非平凡正規子群都有有限指數。
例子
编辑參考
编辑- McCarthy, D., Infinite groups whose proper quotient groups are finite, I (页面存档备份,存于互联网档案馆). Communications on Pure and Applied Mathematics. 1968, 21(6):545–562.
- McCarthy, D., Infinite groups whose proper quotient groups are finite, II (页面存档备份,存于互联网档案馆). Communications on Pure and Applied Mathematics. 1970, 23(5):767–789.