Question
Construct a multiplication table that shows all possible products of the $3 \times 3$ permutation matrices (1.30). List all pairs that commute.
Step 1
A permutation matrix is a square matrix that has exactly one entry of 1 in each row and each column and 0s elsewhere. For a $3 \times 3$ matrix, this means each row and each column contains exactly one 1, with the other entries being 0. Show more…
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Key Concepts
Recommended Videos
Write the three 3 by 3 matrices for $180^{\circ}$ rotations about the $x, y, z$ axes. Show that these three matrices commute (contrary to what we usually expect- see Problems $7.30$ and $7.31$ ). By writing the multiplication table, show that these three matrices with the unit matrix form a group. To which order 4 group is it isomorphic? Hint: See Problem 13.5.
Linear Algebra
Miscellaneous Problems
Compute matrix products column by column and entry by entry. Interpret matrix multiplication in terms of the underlying linear transformations. Use the rules of matrix algebra. Multiply block matrices. If possible, compute the matrix products using paper and pencil. $$\left[\begin{array}{l} 1 \\ 2 \\ 3 \end{array}\right]\left[\begin{array}{lll} 1 & 2 & 3 \end{array}\right]$$
Linear Transformations
Matrix Products
Compute matrix products column by column and entry by entry. Interpret matrix multiplication in terms of the underlying linear transformations. Use the rules of matrix algebra. Multiply block matrices. If possible, compute the matrix products using paper and pencil. $$\left[\begin{array}{lll} 1 & 2 & 3 \end{array}\right]\left[\begin{array}{l} 3 \\ 2 \\ 1 \end{array}\right]$$
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