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Exercise 4

Avg difficulty 3.0

Suppose that, with respect to

B=E2D=⟨(11),(1−1)⟩B={\cal E}_{2}\qquad D=\langle\begin{pmatrix}1\\ 1\end{pmatrix},\begin{pmatrix}1\\ -1\end{pmatrix}\rangle

the transformation t ⁣:R2→R2t\colon\mathbb{R}^{2}\to\mathbb{R}^{2} is represented by this matrix.

(1234)\begin{pmatrix}1&2\\ 3&4\end{pmatrix}

Use change of basis matrices to represent tt with respect to each pair.

  • B^=⟨(01),(11)⟩\hat{B}=\langle\begin{pmatrix}0\\ 1\end{pmatrix},\begin{pmatrix}1\\ 1\end{pmatrix}\rangle, D^=⟨(−10),(21)⟩\hat{D}=\langle\begin{pmatrix}-1\\ 0\end{pmatrix},\begin{pmatrix}2\\ 1\end{pmatrix}\rangle

  • B^=⟨(12),(10)⟩\hat{B}=\langle\begin{pmatrix}1\\ 2\end{pmatrix},\begin{pmatrix}1\\ 0\end{pmatrix}\rangle, D^=⟨(12),(21)⟩\hat{D}=\langle\begin{pmatrix}1\\ 2\end{pmatrix},\begin{pmatrix}2\\ 1\end{pmatrix}\rangle

Hefferon, Linear Algebra, Maps Between Spaces, Changing Map Representations, Exercise 4

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Adapted from Linear Algebra © 2016 Jim Hefferon. Licensed under CC BY-SA 3.0 US. Source: Linear Algebra. Imported at revision df2262e.