※ 引述《PttFund (批踢踢基金)》之銘言：
: (1) Find a basis for the vector space C^2 over the field C.
: (2) Find a basis for the vector space C^2 over the field R.
(1) {(1,0), (0,1)} forms a basis for C^2/C.
(2) {(1,0), (0,1), (i,0), (0,i)} forms a basis for C^2/R.
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