deletions | additions       diff --git a/Complex.tex b/Complex.tex  index 3b3eabb..1e8510a 100644  --- a/Complex.tex  +++ b/Complex.tex 
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This is fondly reminiscent of the steps taken to invert a regular matrix under matrix multiplication, exept exchanges are of rows rather than on diagonal terms and two negatives in a different place. Also there will still exist $\#$ singular matrices when $ac=-bd$. This would make such a quantity the $#$ determinant of the matrix...  Interesting question, if a matrix is normally singular $ad-bc=0$, can it also be $\#$ singular, $ac+bd=0$? There can be if $a$ and $b$ are both $0$, or for certain combinations otherwise, some with complex entries...