deletions | additions       diff --git a/documentclass_article_usepackage_amsmath_begin__.tex b/documentclass_article_usepackage_amsmath_begin__.tex  index 167afcd..fdc0041 100644  --- a/documentclass_article_usepackage_amsmath_begin__.tex  +++ b/documentclass_article_usepackage_amsmath_begin__.tex 
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\begin{document}  \[  M= Y=  \begin{bmatrix}  1 Y_11  & 2 & 3 & 4 & 5 \\ 3 & 4 & 5 & 6 & 7 \\  3 & 3 & 3 & 6 & 3  \end{bmatrix}