如R^4
U := Lin((-1,1,0,0),(1,1,1,1),(3,0,0,1))
W := Lin((2,1,1,1),(1,-1,1,0),(1,-2,1,-1),(-4,-6,-1,-1))
請問"U交集W"為何?
又"U+W"跟"U聯集W"的差異在哪邊?
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