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Revision as of 08:37, 10 June 2013 by HelmutKnaust (Talk | contribs)
- Let \(A=\begin{pmatrix}1&2&3\\4&5&6\\7&8&10\end{pmatrix}\). Find a matrix X such that \(X\cdot A=\begin{pmatrix}7&8&10\\4&5&6\\1&2&3\end{pmatrix}\). What do you get if you compute \(A\cdot X\)?
- Find a 4x4 orthogonal matrix with at least 4 non-zero entries.
- Can you find a 3x3 orthogonal matrix with no zeroes?
