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[]ʬ ϷǤȤ롣 GʬG'GƱ黻˴ؤƷˤʤäƤȤ뤤ñG'GʬsubgroupǤȤ[1]
ǡGG'α黻ƱȤȤڤǤ롣ñƱα黻ȤäƤǤϤʤG'ˤǤȤΤϡGˤƤǤȤʤäƤȤǤ롣
1Gˤơ{e}ñ̸ΤߤʬˤGGȡˤʬǤ롣
ɤΤ褦ʷˤƤΩĤΤǡ2ĤʬȸƤФ롣
2(Z,+)Фơ({3x|xZ},+)ʬǤ롣
3ʬȤGʬǤ롣
GʬȤϸ¤ʤ
[]GζǤʤʬSGʬǤɬʬϼξΤ1Ĥ뤳ȤǤ[1] (i) (ii)