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And one more question, I used exactly the same code that you've written here, and it works fine. Now I want to give the matrix a name, say A, and I wrote $A=$
\begin{tikzpicture}\small
\matrix (2rank) [matrix of math nodes, left delimiter = {[}, right delimiter = {]}]
{%
\phantom{\cdot} & \phantom ...

Wow , thanks. This is really helpful.

Hi,

I'm typesetting a document in amsart document class. I want to show the different cases of a matrix with term rank 2 by drawing two lines in a matrix. How can I make a vertical line and a horizontal line to cross each other, something like: