Identify it as either an invertible matrix or not an invertible matrix for each of the following descriptions of a square matrix below. Use a theorem to justify each of your answers. (a) A 3 × 3 matrix with vectors v, u and (2v − u) as columns.  (b) The following matrix, where a is nonzero    0 a a  a 0 a  a a 0    (c) A matrix A similar to a matrix B that is orthogonal.

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Chapter2: Second-order Linear Odes
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 Identify it as either an invertible matrix or not an invertible matrix for each of the following descriptions of a square matrix below. Use a theorem to justify each of your answers.

(a) A 3 × 3 matrix with vectors v, u and (2v − u) as columns. 

(b) The following matrix, where a is nonzero   

0 a a 

a 0 a 

a a 0   

(c) A matrix A similar to a matrix B that is orthogonal. 

(d) A 3 × 3 matrix representing a transformation T taking a sphere in R^3 to an ellipse in a plane inside R^3 . 

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