deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index 2334ada..6e55402 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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require 2x3=6 say, then (0,1,0)x(1,1,0)=(0,1,1) but also enforce commutation (1,1,0)x(0,1,0)=(0,1,1).  Guess at the moment for two numbers $axb$ do $~(a\^b)$. $\~(a\^b)$.