Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Find the coordinates

$\phi^\ast(\epsilon_{2}^\ast+\epsilon_{3}^\ast)$ in base $A^\ast$

where $A$ is $(3,4,5),(1,3,-2),(0,1,-2)$ and $M(\phi^\ast)_{st}^{st}=\begin{bmatrix} 1 & 3 & 2 \\ 2 & -4 & 1 \\ -3 & 1 & -1 \\ \end{bmatrix}$

Could someone explain the exercie for me?

share|cite|improve this question

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.