Let K be a field and A Mat n K. (a) If A is nilpotent (that

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Let K be a field and A ϵ MatnK.

(a) If A is nilpotent (that is, Am = 0 for some m), then Tr Ar = 0 for all r ≥ 1. 

(b) If char K = 0 and Tr Ar = 0 for all r ≥ 1, the~ A is nilpotent.

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