[texhax] Underbrace magic

Soeren D. Schulze soeren.d.schulze at gmx.de
Mon Apr 11 16:44:53 CEST 2011

I have two questions:

1. Is it possible to make an underbrace spanning several columns in a 
pmatrix or an array (the cells themselves do have content)?
2. What about "diagonal" braces, that is, you have a matrix that has 
some values on the diagonal and you want to make a brace below them 
(concrete example: multiple eigenvalues).

Is that something I can do in plain Latex, or do I have to use TikZ?



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