推 jacky7987 :把vector space的定義全部證一次就好了阿 08/09 22:26
Let R be the set of all ordered pairs of real numbers .
Define scalar multiplication and addition on S by a(x1,x2)=(ax1,ax2)and
(x1,x2)+(y1,y2)=(x1+y1,0),respectively.Is S a vector space?
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