I want to create a block matrix of this form:

enter image description here

But Block A should be a diagonal matrix with 1 on the diagonal, the other blocks should be B, C and D like in the picture. But the size of each block should be equal.

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1 Answer 1


enter image description here

If you put A in a box you can use its size in the other three quadrants:

\usebox{0}&\makebox[\wd0]{\large $B$}\\
  \vphantom{\usebox{0}}\makebox[\wd0]{\large $C$}&\makebox[\wd0]{\large $D$}

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