deletions | additions       diff --git a/documentclass_article_usepackage_amsmath_begin__1.tex b/documentclass_article_usepackage_amsmath_begin__1.tex  index a70b349..d6e1733 100644  --- a/documentclass_article_usepackage_amsmath_begin__1.tex  +++ b/documentclass_article_usepackage_amsmath_begin__1.tex 
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\[  \textbf{X}=  \begin{bmatrix}  1 & 2 0  & 3 0 \\  1 & 0 & 0 \\  0 & 1  & 4 0 \\  0 & 1  & 5 0  \\ 3 0  & 4 0  & 5 1 \\  0  & 6 0  & 7 1 \\  \end{bmatrix}  \]