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lect11 subspace dimensions #16

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@chinkiko

求并(intersect):S∪U=D,dim(S∪U)=9
求交(sum): S∩U=M,dim(S∩U)=3

单词错了
交集 intersection: S∩U=D, dim(S∩U)=3
?:S∪U or S+U
这里教授强调union不是一个subspace,所以改用了加号combination。这里是不是说明一下会更好。

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