(3 An Inan)-matrix A over a field K that is diagonelizable over K is also trigonalizable over K. O True. If K is alge braically closed, then diegonolizakle and trigonalizable and the same. O True. Diagonel metrices are special kinds of toriengular ma- trices, so if A is similar to a dingonel metrik, ib is in Par ticular similar to a triangular matrix. O False. For example, one can check that the real 22) -matrex Matrices are one A= Lů oJ has eigeayelues Id, so A is similar to Eihe dia- gonel matrix Londo However, A has nonzero ea tries both alowe and below the main diagoad, so it is kit trigonalizable. @) False. This is not true in general, but it is true for example if k is algebraically claved Cin which caie every squlve over k is trigonelizeble). metrix

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Chapter4: Eigenvalues And Eigenvectors
Section4.3: Eigenvalues And Eigenvectors Of N X N Matrices
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An Cnan)-matrix A over a field K that is diagonelizable over K
is also trigonalizable
O True. If K is alge braically closed, then dingonaliable and
over k.
trigonalizable matrices are one and the same.
O True. Diagonel metrices are special Kinds of twiengular ma-
trices, so if A is similar to a dingonel metrix, it is in
Particulur similar to a triangular matrix.
© False. For example, one can check that the real [2u2) -matrx
A= L% oJ has eigenyelues t1, so A is similar to Ethe dia-
gonel matorx Lo ad, However, A has noazero en twies both
above and below the main diagoual, so it is aot triganalizable.
d) False This is not true in general, but it is true for example
if k is algebraicelly cloved Cin which case every squere
over k is trigonelibable).
3.
Transcribed Image Text:An Cnan)-matrix A over a field K that is diagonelizable over K is also trigonalizable O True. If K is alge braically closed, then dingonaliable and over k. trigonalizable matrices are one and the same. O True. Diagonel metrices are special Kinds of twiengular ma- trices, so if A is similar to a dingonel metrix, it is in Particulur similar to a triangular matrix. © False. For example, one can check that the real [2u2) -matrx A= L% oJ has eigenyelues t1, so A is similar to Ethe dia- gonel matorx Lo ad, However, A has noazero en twies both above and below the main diagoual, so it is aot triganalizable. d) False This is not true in general, but it is true for example if k is algebraicelly cloved Cin which case every squere over k is trigonelibable). 3.
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