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No; No.
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m≤n , n≤m .
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A=1100−2010−4001 .
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(a) 765765765 .
(b) (121001) .
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No.
Proof dim(imA)+dim(kerA)=3 , dim(imA)=dim(kerA) □ .
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10000100000000000000 .
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2≤N≤5 .
Proof dim(kerT)+dim(imT)=5 , imT⊆R3 , 0≤imT≤3 □ .
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N≤4 .
Proof dim(imT)+dim(kerT)=4 □ .