deletions | additions       diff --git a/text_ref_left_cal_A__.tex b/text_ref_left_cal_A__.tex  index 1aac2c3..dc9ac8b 100644  --- a/text_ref_left_cal_A__.tex  +++ b/text_ref_left_cal_A__.tex 
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0 & 0 & 1 & \dots & a'_{3,n} & b'_3\\  \vdots & \vdots & \vdots & \ddots & \vdots & \vdots \\  0 & 0 & 0 & \dots & 1 & b'_n  \end{pmatrix}\) \end{pmatrix}$