deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index 434e21b..fc244c3 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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A prominent feature in relativistic physics is the Minkowski metric tensor \begin{equation}  \nu \eta  = \begin{bmatrix} 1 & 0 & 0 & 0 \\  0 & -1 & 0 & 0\\  0 & 0 & -1 & 0\\ 
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On probing where this comes from it was postulated that the matrix was the 'Real' (non-quaternion) part of the outer product of two unit quaternions $Q= w + xi + yj +zk$, \begin{equation}  \nu \eta  = Q \otimes Q =Re(\begin{bmatrix} 1 & i & j & k \\  i & -1 & k & -j\\  j & -k & -1 & i\\