True or False? In Exercises 69 and 70, determine whether each statement is true or false. If a statement is true, give a reason or cite an appropriate statement from the text. If a statement is false, provide an example that shows the statement is not true in all cases or cite an appropriate statement from the text.
(a) An eigenvalue of a matrix A is a scalar
(b) An eigenvector may be the zero
(c) A matrix A is orthogonally diagonalizable when there exists an orthogonal matrix P such that
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