If <img src="https://static.zxtiku.com/wangke/imgs/topic/1ad2cfbe9edff5b0f5f97e02c840d22d.png"/> , <img src="https://static.zxtiku.com/wangke/imgs/topic/3b5239b853d99c21947cc1f0e774dffb.png"/> are both linear operators on a vector space V, then <img src="https://static.zxtiku.com/wangke/imgs/topic/62f893ac47fca87a0b8b071682eccdee.png"/>is also a linear operator on V, where <img src="https://static.zxtiku.com/wangke/imgs/topic/62f893ac47fca87a0b8b071682eccdee.png"/> is the mapping deﬁned by <img src="https://static.zxtiku.com/wangke/imgs/topic/dfe87c4b74731e9a0149e811d7e56cd5.png"/>for all <img src="https://static.zxtiku.com/wangke/imgs/topic/6f1ba909d3210877adbd4deba1c72bfa.png"/>