Practice problem
Which of the following are identity matrices?
[111111111]\begin{bmatrix} 1&1&1\\ 1&1&1\\ 1&1&1 \end{bmatrix}111111111
[100010001]\begin{bmatrix} 1&0&0\\ 0&1&0\\ 0&0&1 \end{bmatrix}100010001
[011101110]\begin{bmatrix} 0&1&1\\ 1&0&1\\ 1&1&0 \end{bmatrix}011101110
[100100100]\begin{bmatrix} 1&0&0\\ 1&0&0\\ 1&0&0 \end{bmatrix}111000000
[100010]\begin{bmatrix} 1&0&0\\ 0&1&0 \end{bmatrix}[100100]
Type a concept, like “slope” or “photosynthesis”.
