deletions | additions       diff --git a/Old QFT.tex b/Old QFT.tex  index 1e46e79..d0433cb 100644  --- a/Old QFT.tex  +++ b/Old QFT.tex 
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2aa^+a=aaa^+ + a^+aa  \end{equation}  Deep representation concept, if aa^+a $aa^+a$  were equivalent to cos then aaa^+ $aaa^+$  is equivalent to exp(i...) and a^+aa $a^+aa$  is equivalent to exp(-i...) then isin is equivalent to a $a$  as is cos as operators. Kind of rotation. Some relationships \begin{equation}