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Exercise 5

Avg difficulty 3.0

Consider this matrix, representing a transformation of R2\mathbb{R}^{2} with respect to the bases.

12⋅(11−11)B=⟨(01),(10)⟩D=⟨(11),(1−1)⟩\frac{1}{2}\cdot\begin{pmatrix}1&1\\ -1&1\end{pmatrix}\qquad B=\langle\begin{pmatrix}0\\ 1\end{pmatrix},\begin{pmatrix}1\\ 0\end{pmatrix}\rangle\quad D=\langle\begin{pmatrix}1\\ 1\end{pmatrix},\begin{pmatrix}1\\ -1\end{pmatrix}\rangle
  • To what vector in the codomain is the first member of BB mapped?

  • The second member?

  • Where is a general vector from the domain (a vector with components xx and yy) mapped? That is, what transformation of R2\mathbb{R}^{2} is represented with respect to B,DB,D by this matrix?

Hefferon, Linear Algebra, Maps Between Spaces, Any Matrix Represents a Linear Map, Exercise 5

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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.