[線代] 一題證明題
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Let T be a linear operator from C to itself and λ屬於 C . Let N(T) denote
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the null space of T. Prove that for every basis of C with respect to which
T has an upper-triangular matrix, λ appears on the diagonal of the matrix
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of T precisely dim N((T-λI) ) times, or disprove it by giving a counter
example.
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