MatrixTrace: Can we typeset some matrices in earlier levels to improve readability?

[TentativeConvert]

For example, level 1 asks us to show something A i j • E i j. The notation is confusing insofar as A i j is a scalar and E i j is a matrix. It might help to make use of latex to spell out in the chat that

A = \begin{matrix} … A i j … \end{matrix} 

and

E i j = \begin{matrix} … \end{matrix}

to clarify how this is to be read.

[TentativeConvert]

Done: bed81540be524ee91e5b34950543faaa4609ba7d